diff --git a/.gitignore b/.gitignore
index dd59a16..d44a61b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,7 +5,6 @@
 .import/
 .export/
 export.cfg
-export_presets.cfg
 
 # Imported translations (automatically generated from CSV files)
 *.translation
diff --git a/.vscode/extensions.json b/.vscode/extensions.json
new file mode 100644
index 0000000..2948ac0
--- /dev/null
+++ b/.vscode/extensions.json
@@ -0,0 +1,5 @@
+{
+	"recommendations": [
+		"geequlim.godot-tools",
+	]
+}
diff --git a/.vscode/settings.json b/.vscode/settings.json
new file mode 100644
index 0000000..71e1197
--- /dev/null
+++ b/.vscode/settings.json
@@ -0,0 +1,13 @@
+{
+	"files.exclude": {
+		".godot": true,
+		"**/*.godot": true,
+		"**/*.tres": true,
+		"**/*.tscn": true,
+		"**/*.import": true,
+	},
+	"files.associations": {
+		"*.gdignore": "ignore",
+	},
+	"editor.insertSpaces": false,
+}
diff --git a/Game.gd b/Game.gd
new file mode 100644
index 0000000..3a8cf79
--- /dev/null
+++ b/Game.gd
@@ -0,0 +1,8 @@
+extends Node2D
+
+func _on_roller_failure():
+	print("failure")
+
+
+func _on_roller_success():
+	print("success")
diff --git a/bottle/bottle.gd b/bottle/bottle.gd
new file mode 100644
index 0000000..7edbaf4
--- /dev/null
+++ b/bottle/bottle.gd
@@ -0,0 +1,11 @@
+extends TileMap
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta):
+	pass
diff --git a/bottle/gravity_from_gyro.gd b/bottle/gravity_from_gyro.gd
index 52cc29b..7d91eb0 100644
--- a/bottle/gravity_from_gyro.gd
+++ b/bottle/gravity_from_gyro.gd
@@ -4,6 +4,8 @@ class_name GravityFromGyro
 
 func _physics_process(_delta):
 	var accel_3d = Input.get_accelerometer()
+	if accel_3d == Vector3.ZERO:  # If accelerometer is not supported
+		accel_3d = Vector3.DOWN * 9.8
+	
 	var accel_2d = Vector2(accel_3d.x, -accel_3d.y) / 9.8
 	PhysicsServer2D.area_set_param(get_viewport().find_world_2d().space, PhysicsServer2D.AREA_PARAM_GRAVITY_VECTOR, accel_2d)
-
diff --git a/collector/collectible.gd b/collector/collectible.gd
new file mode 100644
index 0000000..7905c1e
--- /dev/null
+++ b/collector/collectible.gd
@@ -0,0 +1,18 @@
+extends Node
+class_name Collectible
+## A marker for collectible entities.
+##
+## Used by [Collector]s to determine which entities to pick up.
+
+
+## The type of collectible entity the parent entity represents.
+@export var type: StringName
+
+## Emitted when this entity has been collected by a collector.
+signal collected
+
+## Mark this entity as collected.
+##
+## You'll probably want to connect this to an AudioSource2D, which will disable the node and play a sound, and when the sound is over a new signal will queue_free it.
+func collect():
+	emit_signal("collected")
diff --git a/collector/collectible.tscn b/collector/collectible.tscn
new file mode 100644
index 0000000..0713a93
--- /dev/null
+++ b/collector/collectible.tscn
@@ -0,0 +1,9 @@
+[gd_scene load_steps=3 format=3 uid="uid://bk1vvq5rug01m"]
+
+[ext_resource type="Script" path="res://collector/collectible.gd" id="1_qilbk"]
+[ext_resource type="PackedScene" uid="uid://ujpra0s1kpqi" path="res://value/valuable.tscn" id="2_2nvfu"]
+
+[node name="Collectible" type="Node"]
+script = ExtResource("1_qilbk")
+
+[node name="Valuable" parent="." instance=ExtResource("2_2nvfu")]
diff --git a/collector/collector.gd b/collector/collector.gd
new file mode 100644
index 0000000..c9a4266
--- /dev/null
+++ b/collector/collector.gd
@@ -0,0 +1,39 @@
+extends Area2D
+class_name Collector
+## Area that will pick up [Collectible]s with a given name, keeping track of the amount collected.
+
+
+## The current amount of collected entities.
+var collected_count: int = 0
+
+## The types of [Collectible]s to pick up.
+##
+## The strings will match only if exactly the same.
+@export var collecting_types: Array[StringName]
+
+## The collision mask to check colliding body against.
+@export_flags_2d_physics var collecting_collision_mask: int
+
+## The goal amount of entities to collect.
+##
+## When [collected_count] reaches it, it will be reset to zero, and the "goal" signal will be emitted.
+@export var collecting_amount: int
+
+## The collector has picked up an object.
+signal collected(what: PhysicsBody2D)
+
+## The collector has received its collection goal and is about to reset.
+signal goal
+
+
+func _on_body_entered(body: Node2D):
+	if body is PhysicsBody2D:
+		if body.collision_layer & collecting_collision_mask:
+			var collectible: Collectible = body.get_node("Collectible")
+			if collectible.type in collecting_types:
+				collected_count += 1
+				collectible.collect()
+				emit_signal("collected", body)
+				if collected_count >= collecting_amount:
+					emit_signal("goal")
+					collected_count = 0
diff --git a/collector/collector.tscn b/collector/collector.tscn
new file mode 100644
index 0000000..0273735
--- /dev/null
+++ b/collector/collector.tscn
@@ -0,0 +1,8 @@
+[gd_scene load_steps=2 format=3 uid="uid://c5w3b55aiui6c"]
+
+[ext_resource type="Script" path="res://collector/collector.gd" id="1_1xtt5"]
+
+[node name="Collector" type="Area2D"]
+script = ExtResource("1_1xtt5")
+
+[connection signal="body_entered" from="." to="." method="_on_body_entered"]
diff --git a/convertitore.tscn b/convertitore.tscn
new file mode 100644
index 0000000..a4b80f1
--- /dev/null
+++ b/convertitore.tscn
@@ -0,0 +1,26 @@
+[gd_scene load_steps=3 format=3 uid="uid://ei1b0ity3nwg"]
+
+[ext_resource type="Script" path="res://Convertitore.gd" id="1_7de38"]
+[ext_resource type="Texture2D" uid="uid://cxsl5yvdhswc7" path="res://icon.png" id="2_8bfs6"]
+
+[node name="Convertitore" type="Node2D"]
+script = ExtResource("1_7de38")
+
+[node name="Icon" type="Sprite2D" parent="."]
+position = Vector2(61, 76)
+rotation = 1.5708
+scale = Vector2(0.2, 0.2)
+texture = ExtResource("2_8bfs6")
+
+[node name="StaticBody2D" type="StaticBody2D" parent="."]
+
+[node name="CollisionPolygon2D" type="CollisionPolygon2D" parent="StaticBody2D"]
+polygon = PackedVector2Array(36, 114, 36, 38, 42, 56, 61, 57, 79, 56, 85, 38, 85, 115, 61, 91)
+
+[node name="Ingresso" type="Area2D" parent="."]
+position = Vector2(56, 42)
+
+[node name="CollisionPolygon2D" type="CollisionPolygon2D" parent="Ingresso"]
+polygon = PackedVector2Array(-20, -6, 29, -6, 23, 11, 5, 14, -12, 12)
+
+[connection signal="body_shape_entered" from="Ingresso" to="." method="_on_ingresso_body_shape_entered"]
diff --git a/entity/coin_copper.tscn b/entity/coin_copper.tscn
index a788a5f..20fb5ea 100644
--- a/entity/coin_copper.tscn
+++ b/entity/coin_copper.tscn
@@ -1,8 +1,10 @@
-[gd_scene load_steps=5 format=3 uid="uid://c3kitncwpi42j"]
+[gd_scene load_steps=7 format=3 uid="uid://c3kitncwpi42j"]
 
 [ext_resource type="PhysicsMaterial" uid="uid://c6kn1an85lccr" path="res://entity/coin_physics_material.tres" id="1_8k46m"]
 [ext_resource type="Texture2D" uid="uid://dbdkb4vt7dh85" path="res://entity/coin_copper_4.png" id="1_wedw1"]
 [ext_resource type="Texture2D" uid="uid://2vtvoj6ua3cb" path="res://entity/coin_copper_outline_2.png" id="2_2ifq3"]
+[ext_resource type="PackedScene" uid="uid://bk1vvq5rug01m" path="res://collector/collectible.tscn" id="4_yefrx"]
+[ext_resource type="PackedScene" uid="uid://ujpra0s1kpqi" path="res://value/valuable.tscn" id="5_jdvvd"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_c6byl"]
 size = Vector2(16, 5)
@@ -28,3 +30,9 @@ texture = ExtResource("1_wedw1")
 z_index = -10
 texture_filter = 1
 texture = ExtResource("2_2ifq3")
+
+[node name="Collectible" parent="." instance=ExtResource("4_yefrx")]
+type = &"Copper"
+
+[node name="Valuable" parent="." instance=ExtResource("5_jdvvd")]
+value = 1
diff --git a/export_presets.cfg b/export_presets.cfg
new file mode 100644
index 0000000..20ed2b4
--- /dev/null
+++ b/export_presets.cfg
@@ -0,0 +1,201 @@
+[preset.0]
+
+name="Android"
+platform="Android"
+runnable=true
+dedicated_server=false
+custom_features=""
+export_filter="all_resources"
+include_filter=""
+exclude_filter=""
+export_path=""
+encryption_include_filters=""
+encryption_exclude_filters=""
+encrypt_pck=false
+encrypt_directory=false
+
+[preset.0.options]
+
+custom_template/debug=""
+custom_template/release=""
+gradle_build/use_gradle_build=false
+gradle_build/export_format=0
+gradle_build/min_sdk=""
+gradle_build/target_sdk=""
+architectures/armeabi-v7a=false
+architectures/arm64-v8a=true
+architectures/x86=false
+architectures/x86_64=false
+version/code=1
+version/name="1.0"
+package/unique_name="org.godotengine.$genname"
+package/name=""
+package/signed=true
+package/app_category=2
+package/retain_data_on_uninstall=false
+package/exclude_from_recents=false
+launcher_icons/main_192x192=""
+launcher_icons/adaptive_foreground_432x432=""
+launcher_icons/adaptive_background_432x432=""
+graphics/opengl_debug=false
+xr_features/xr_mode=0
+xr_features/hand_tracking=0
+xr_features/hand_tracking_frequency=0
+xr_features/passthrough=0
+screen/immersive_mode=true
+screen/support_small=true
+screen/support_normal=true
+screen/support_large=true
+screen/support_xlarge=true
+user_data_backup/allow=false
+command_line/extra_args=""
+apk_expansion/enable=false
+apk_expansion/SALT=""
+apk_expansion/public_key=""
+permissions/custom_permissions=PackedStringArray()
+permissions/access_checkin_properties=false
+permissions/access_coarse_location=false
+permissions/access_fine_location=false
+permissions/access_location_extra_commands=false
+permissions/access_mock_location=false
+permissions/access_network_state=false
+permissions/access_surface_flinger=false
+permissions/access_wifi_state=false
+permissions/account_manager=false
+permissions/add_voicemail=false
+permissions/authenticate_accounts=false
+permissions/battery_stats=false
+permissions/bind_accessibility_service=false
+permissions/bind_appwidget=false
+permissions/bind_device_admin=false
+permissions/bind_input_method=false
+permissions/bind_nfc_service=false
+permissions/bind_notification_listener_service=false
+permissions/bind_print_service=false
+permissions/bind_remoteviews=false
+permissions/bind_text_service=false
+permissions/bind_vpn_service=false
+permissions/bind_wallpaper=false
+permissions/bluetooth=false
+permissions/bluetooth_admin=false
+permissions/bluetooth_privileged=false
+permissions/brick=false
+permissions/broadcast_package_removed=false
+permissions/broadcast_sms=false
+permissions/broadcast_sticky=false
+permissions/broadcast_wap_push=false
+permissions/call_phone=false
+permissions/call_privileged=false
+permissions/camera=false
+permissions/capture_audio_output=false
+permissions/capture_secure_video_output=false
+permissions/capture_video_output=false
+permissions/change_component_enabled_state=false
+permissions/change_configuration=false
+permissions/change_network_state=false
+permissions/change_wifi_multicast_state=false
+permissions/change_wifi_state=false
+permissions/clear_app_cache=false
+permissions/clear_app_user_data=false
+permissions/control_location_updates=false
+permissions/delete_cache_files=false
+permissions/delete_packages=false
+permissions/device_power=false
+permissions/diagnostic=false
+permissions/disable_keyguard=false
+permissions/dump=false
+permissions/expand_status_bar=false
+permissions/factory_test=false
+permissions/flashlight=false
+permissions/force_back=false
+permissions/get_accounts=false
+permissions/get_package_size=false
+permissions/get_tasks=false
+permissions/get_top_activity_info=false
+permissions/global_search=false
+permissions/hardware_test=false
+permissions/inject_events=false
+permissions/install_location_provider=false
+permissions/install_packages=false
+permissions/install_shortcut=false
+permissions/internal_system_window=false
+permissions/internet=false
+permissions/kill_background_processes=false
+permissions/location_hardware=false
+permissions/manage_accounts=false
+permissions/manage_app_tokens=false
+permissions/manage_documents=false
+permissions/manage_external_storage=false
+permissions/master_clear=false
+permissions/media_content_control=false
+permissions/modify_audio_settings=false
+permissions/modify_phone_state=false
+permissions/mount_format_filesystems=false
+permissions/mount_unmount_filesystems=false
+permissions/nfc=false
+permissions/persistent_activity=false
+permissions/process_outgoing_calls=false
+permissions/read_calendar=false
+permissions/read_call_log=false
+permissions/read_contacts=false
+permissions/read_external_storage=false
+permissions/read_frame_buffer=false
+permissions/read_history_bookmarks=false
+permissions/read_input_state=false
+permissions/read_logs=false
+permissions/read_phone_state=false
+permissions/read_profile=false
+permissions/read_sms=false
+permissions/read_social_stream=false
+permissions/read_sync_settings=false
+permissions/read_sync_stats=false
+permissions/read_user_dictionary=false
+permissions/reboot=false
+permissions/receive_boot_completed=false
+permissions/receive_mms=false
+permissions/receive_sms=false
+permissions/receive_wap_push=false
+permissions/record_audio=false
+permissions/reorder_tasks=false
+permissions/restart_packages=false
+permissions/send_respond_via_message=false
+permissions/send_sms=false
+permissions/set_activity_watcher=false
+permissions/set_alarm=false
+permissions/set_always_finish=false
+permissions/set_animation_scale=false
+permissions/set_debug_app=false
+permissions/set_orientation=false
+permissions/set_pointer_speed=false
+permissions/set_preferred_applications=false
+permissions/set_process_limit=false
+permissions/set_time=false
+permissions/set_time_zone=false
+permissions/set_wallpaper=false
+permissions/set_wallpaper_hints=false
+permissions/signal_persistent_processes=false
+permissions/status_bar=false
+permissions/subscribed_feeds_read=false
+permissions/subscribed_feeds_write=false
+permissions/system_alert_window=false
+permissions/transmit_ir=false
+permissions/uninstall_shortcut=false
+permissions/update_device_stats=false
+permissions/use_credentials=false
+permissions/use_sip=false
+permissions/vibrate=false
+permissions/wake_lock=false
+permissions/write_apn_settings=false
+permissions/write_calendar=false
+permissions/write_call_log=false
+permissions/write_contacts=false
+permissions/write_external_storage=false
+permissions/write_gservices=false
+permissions/write_history_bookmarks=false
+permissions/write_profile=false
+permissions/write_secure_settings=false
+permissions/write_settings=false
+permissions/write_sms=false
+permissions/write_social_stream=false
+permissions/write_sync_settings=false
+permissions/write_user_dictionary=false
diff --git a/game/game.gd b/game/game.gd
new file mode 100644
index 0000000..e2e8253
--- /dev/null
+++ b/game/game.gd
@@ -0,0 +1,9 @@
+extends Node2D
+class_name Game
+
+
+@onready var button_spawner = $ButtonSpawner
+
+
+func trigger_spawn():
+	button_spawner.spawn()
diff --git a/game/game.tscn b/game/game.tscn
new file mode 100644
index 0000000..e5a29fd
--- /dev/null
+++ b/game/game.tscn
@@ -0,0 +1,37 @@
+[gd_scene load_steps=6 format=3 uid="uid://c3rxmcwa5nqng"]
+
+[ext_resource type="Script" path="res://game/game.gd" id="1_i3ly0"]
+[ext_resource type="PackedScene" uid="uid://bllsprv8orpn4" path="res://bottle/bottle.tscn" id="1_y7o2l"]
+[ext_resource type="PackedScene" uid="uid://d05b8jy3xmpcb" path="res://bottle/gravity_from_gyro.tscn" id="2_h2pfr"]
+[ext_resource type="PackedScene" uid="uid://c67lfbk4gf1ga" path="res://spawner/spawner.tscn" id="3_qwsty"]
+[ext_resource type="PackedScene" uid="uid://c3kitncwpi42j" path="res://entity/coin_copper.tscn" id="4_e5nwi"]
+
+[node name="Game" type="Node2D"]
+texture_filter = 1
+script = ExtResource("1_i3ly0")
+
+[node name="Bottle" parent="." instance=ExtResource("1_y7o2l")]
+
+[node name="GravityFromGyro" parent="Bottle" instance=ExtResource("2_h2pfr")]
+
+[node name="TimeSpawner" parent="." instance=ExtResource("3_qwsty")]
+position = Vector2(0, -480)
+scene = ExtResource("4_e5nwi")
+buffer_cap = 1
+spawn_position_range_x = 32.0
+spawn_rotation_range = 15.0
+overlapping_bodies_collision_mask = 4
+overlapping_body_count_limit = 4
+
+[node name="Timer" type="Timer" parent="TimeSpawner"]
+
+[node name="ButtonSpawner" parent="." instance=ExtResource("3_qwsty")]
+position = Vector2(0, -480)
+scene = ExtResource("4_e5nwi")
+buffer_cap = 50
+spawn_position_range_x = 32.0
+spawn_rotation_range = 15.0
+overlapping_bodies_collision_mask = 4
+overlapping_body_count_limit = 4
+
+[connection signal="timeout" from="TimeSpawner/Timer" to="TimeSpawner" method="spawn"]
diff --git a/interface/game_container.tscn b/interface/game_container.tscn
new file mode 100644
index 0000000..fb1b98c
--- /dev/null
+++ b/interface/game_container.tscn
@@ -0,0 +1,15 @@
+[gd_scene load_steps=2 format=3 uid="uid://c0uce7ssweke"]
+
+[ext_resource type="PackedScene" uid="uid://c3rxmcwa5nqng" path="res://game/game.tscn" id="1_dbqdv"]
+
+[node name="GameContainer" type="Control"]
+layout_mode = 3
+anchors_preset = 7
+anchor_left = 0.5
+anchor_top = 1.0
+anchor_right = 0.5
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 0
+
+[node name="Game" parent="." instance=ExtResource("1_dbqdv")]
diff --git a/interface/game_ui.gd b/interface/game_ui.gd
new file mode 100644
index 0000000..5717b98
--- /dev/null
+++ b/interface/game_ui.gd
@@ -0,0 +1,21 @@
+extends VBoxContainer
+class_name GameUI
+
+## Emitted when the Score button is pressed.
+signal score_button_pressed
+
+## Emitted when the Spawn button is pressed.
+signal spawn_button_pressed 
+
+## Emitted when the Shop button is presesd.
+signal shop_button_pressed
+
+
+func _on_score_button_pressed():
+	score_button_pressed.emit()
+
+func _on_spawn_button_pressed():
+	spawn_button_pressed.emit()
+
+func _on_shop_button_pressed():
+	shop_button_pressed.emit()
diff --git a/interface/game_ui.tscn b/interface/game_ui.tscn
new file mode 100644
index 0000000..13b44fb
--- /dev/null
+++ b/interface/game_ui.tscn
@@ -0,0 +1,51 @@
+[gd_scene load_steps=3 format=3 uid="uid://bo5unrhqpoyim"]
+
+[ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="1_ppf8y"]
+[ext_resource type="Script" path="res://interface/game_ui.gd" id="2_33nqa"]
+
+[node name="GameUI" type="VBoxContainer"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+theme = ExtResource("1_ppf8y")
+script = ExtResource("2_33nqa")
+
+[node name="UpperButtons" type="HBoxContainer" parent="."]
+custom_minimum_size = Vector2(0, 54)
+layout_mode = 2
+size_flags_vertical = 8
+alignment = 1
+
+[node name="ScoreButton" type="Button" parent="UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 0
+text = "$0"
+alignment = 0
+
+[node name="UpperButtonsSpacerLeft" type="Control" parent="UpperButtons"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="SpawnButton" type="Button" parent="UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 4
+text = "Drop"
+
+[node name="UpperButtonsSpacerRight" type="Control" parent="UpperButtons"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="ShopButton" type="Button" parent="UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 8
+text = "Shop"
+alignment = 2
+
+[connection signal="pressed" from="UpperButtons/ScoreButton" to="." method="_on_score_button_pressed"]
+[connection signal="pressed" from="UpperButtons/SpawnButton" to="." method="_on_spawn_button_pressed"]
+[connection signal="pressed" from="UpperButtons/ShopButton" to="." method="_on_shop_button_pressed"]
diff --git a/interface/interface_theme.tres b/interface/interface_theme.tres
new file mode 100644
index 0000000..7381328
--- /dev/null
+++ b/interface/interface_theme.tres
@@ -0,0 +1,6 @@
+[gd_resource type="Theme" load_steps=2 format=3 uid="uid://ba5utvfhnxa5i"]
+
+[ext_resource type="FontFile" uid="uid://cs8tiwyb76gig" path="res://font/press-start/prstart.ttf" id="1_mtdor"]
+
+[resource]
+default_font = ExtResource("1_mtdor")
diff --git a/interface/purchasable_item.gd b/interface/purchasable_item.gd
new file mode 100644
index 0000000..817e5fb
--- /dev/null
+++ b/interface/purchasable_item.gd
@@ -0,0 +1,95 @@
+extends Panel
+class_name PurchasableItem
+
+## Icon of the item that can be purchased.
+@export var item_icon: Texture2D:
+	get: 
+		return item_icon
+	set(value):
+		item_icon = value
+		$Contents/Header/IconRect.texture = item_icon
+
+## Name of the item that can be purchased.
+@export var item_name: String:
+	get:
+		return item_name
+	set(value):
+		item_name = value
+		$Contents/Header/NameLabel.text = value
+
+## Description of the item that can be purchased.
+@export var item_description: String:
+	get:
+		return item_description
+	set(value):
+		item_description = value
+		$Contents/Header/DescriptionLabel.text = value
+
+## Text to be displayed on the cost label of the item.
+@export var item_cost_text: String: 
+	get:
+		return item_cost_text
+	set(value):
+		item_cost_text = value
+		$Contents/Action/CostLabel.text = value
+
+## Collectible type of the item required to buy the item.
+@export var item_cost_type: StringName
+
+## Amount of items of the given type to collect to buy the item.
+@export var item_cost_goal: int
+
+## Whether the player can click or not the Buy button.
+##
+## Used to prevent two items from getting bought at the same time.
+@export var can_buy: bool = true:
+	get:
+		return can_buy
+	set(value):
+		can_buy = value
+		$Contents/Action/BuyButton.disabled = not (can_buy && has_unlocked)
+
+## Whether the player has unlocked this item for purchase.
+##
+## Used to force the player to follow the tech tree.
+@export var has_unlocked: bool = true:
+	get:
+		return has_unlocked
+	set(value):
+		has_unlocked = value
+		$Contents/Action/BuyButton.disabled = not (can_buy && has_unlocked)
+
+## Whether the player is currently buying this item.
+##
+## Used to cancel the purchase.
+var is_buying: bool: 
+	get:
+		return is_buying
+	set(value):
+		is_buying = value
+		$Contents/Action/BuyButton.text = "Cancel" if value else "Buy"
+
+
+## Emitted when a purchase has started.
+signal purchase_begin
+
+## Emitted when a purchase is cancelled.
+signal purchase_cancel
+
+## Emitted when a purchase is completed.
+##
+## Emitted by complete_purchase().
+signal purchase_success
+
+
+func _on_buy_button_pressed():
+	if is_buying:
+		is_buying = false
+		purchase_cancel.emit()
+	else:
+		is_buying = true
+		purchase_begin.emit()
+
+func complete_purchase():
+	is_buying = false
+	purchase_success.emit()
diff --git a/interface/purchasable_item.tscn b/interface/purchasable_item.tscn
new file mode 100644
index 0000000..e1ef5f6
--- /dev/null
+++ b/interface/purchasable_item.tscn
@@ -0,0 +1,118 @@
+[gd_scene load_steps=4 format=3 uid="uid://dul1fpyh733t7"]
+
+[ext_resource type="Texture2D" uid="uid://cxsl5yvdhswc7" path="res://icon.png" id="1_drwcj"]
+[ext_resource type="Script" path="res://interface/purchasable_item.gd" id="1_h8jix"]
+[ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="1_r2qbu"]
+
+[node name="PurchasableItem" type="Panel"]
+custom_minimum_size = Vector2(0, 182)
+anchors_preset = 10
+anchor_right = 1.0
+grow_horizontal = 2
+size_flags_horizontal = 3
+theme = ExtResource("1_r2qbu")
+script = ExtResource("1_h8jix")
+
+[node name="Contents" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="HeaderPaddingTop" type="Control" parent="Contents"]
+custom_minimum_size = Vector2(0, 4)
+layout_mode = 2
+
+[node name="Header" type="HBoxContainer" parent="Contents"]
+layout_mode = 2
+size_flags_vertical = 8
+
+[node name="IconPaddingLeft" type="Control" parent="Contents/Header"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="IconRect" type="TextureRect" parent="Contents/Header"]
+custom_minimum_size = Vector2(54, 54)
+layout_mode = 2
+texture = ExtResource("1_drwcj")
+expand_mode = 2
+
+[node name="IconNameSeparator" type="Control" parent="Contents/Header"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="NameLabel" type="Label" parent="Contents/Header"]
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_font_sizes/font_size = 16
+text = "ITEMNAME"
+uppercase = true
+
+[node name="NamePaddingRight" type="Control" parent="Contents/Header"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="HeaderDescriptionPadding" type="Control" parent="Contents"]
+custom_minimum_size = Vector2(0, 4)
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="Description" type="HBoxContainer" parent="Contents"]
+layout_mode = 2
+size_flags_vertical = 4
+
+[node name="DescriptionPaddingLeft" type="Control" parent="Contents/Description"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="DescriptionLabel" type="Label" parent="Contents/Description"]
+layout_mode = 2
+size_flags_horizontal = 3
+theme_override_font_sizes/font_size = 16
+text = "What does this item do? Nobody knows."
+autowrap_mode = 2
+
+[node name="DescriptionPaddingRight" type="Control" parent="Contents/Description"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="DescriptionActionPadding" type="Control" parent="Contents"]
+custom_minimum_size = Vector2(0, 4)
+layout_mode = 2
+size_flags_vertical = 3
+
+[node name="Action" type="HBoxContainer" parent="Contents"]
+layout_mode = 2
+size_flags_vertical = 0
+
+[node name="BuyButtonPaddingLeft" type="Control" parent="Contents/Action"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="BuyButton" type="Button" parent="Contents/Action"]
+layout_mode = 2
+text = "Buy"
+
+[node name="BuyCostPadding" type="Control" parent="Contents/Action"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="CostLabel" type="Label" parent="Contents/Action"]
+layout_mode = 2
+size_flags_horizontal = 10
+theme_override_font_sizes/font_size = 16
+text = "3 fiorygi"
+horizontal_alignment = 2
+vertical_alignment = 1
+
+[node name="CostLabelPaddingRight" type="Control" parent="Contents/Action"]
+custom_minimum_size = Vector2(8, 0)
+layout_mode = 2
+
+[node name="ActionPaddingBottom" type="Control" parent="Contents"]
+custom_minimum_size = Vector2(0, 4)
+layout_mode = 2
+
+[connection signal="pressed" from="Contents/Action/BuyButton" to="." method="_on_buy_button_pressed"]
diff --git a/interface/purchasable_item_padding.tscn b/interface/purchasable_item_padding.tscn
new file mode 100644
index 0000000..a249774
--- /dev/null
+++ b/interface/purchasable_item_padding.tscn
@@ -0,0 +1,6 @@
+[gd_scene format=3 uid="uid://wodgj6rp2ewm"]
+
+[node name="PurchasableItemPadding" type="Control"]
+custom_minimum_size = Vector2(0, 8)
+layout_mode = 3
+anchors_preset = 0
diff --git a/interface/shop_ui.gd b/interface/shop_ui.gd
new file mode 100644
index 0000000..b17c66c
--- /dev/null
+++ b/interface/shop_ui.gd
@@ -0,0 +1,71 @@
+extends Panel
+class_name ShopUI
+
+## Emitted when the Score button is pressed.
+signal score_button_pressed
+
+## Emitted when the Delete button is pressed.
+signal delete_button_pressed 
+
+## Emitted when the Back button is presesd.
+signal back_button_pressed
+
+## Emitted when any purchase has started.
+signal purchase_begin(what: PurchasableItem)
+
+## Emitted when any purchase is cancelled.
+signal purchase_cancel(what: PurchasableItem)
+
+## Emitted when any purchase is completed.
+##
+## Emitted by complete_purchase().
+signal purchase_success(what: PurchasableItem)
+
+## Array of all PurchasableItems that this ShopUI should control.
+@onready var purchasable_items: Array[Node] = find_children("*", "PurchasableItem") as Array[Node]
+
+
+func _ready():
+	for item in purchasable_items:
+		item.purchase_begin.connect(_on_any_purchase_begin.bind(item))
+		item.purchase_cancel.connect(_on_any_purchase_cancel.bind(item))
+		item.purchase_success.connect(_on_any_purchase_success.bind(item))
+
+func _on_any_purchase_begin(what: Node):
+	if not what is PurchasableItem:
+		push_error("Purchase began outside a PurchasableItem")
+		return
+	purchase_begin.emit(what)
+	for item in purchasable_items:
+		if item == what:
+			continue
+		item.can_buy = false
+
+func _on_any_purchase_cancel(what: Node):
+	if not what is PurchasableItem:
+		push_error("Purchase cancelled outside a PurchasableItem")
+		return
+	purchase_cancel.emit(what)
+	for item in purchasable_items:
+		if item == what:
+			continue
+		item.can_buy = true
+
+func _on_any_purchase_success(what: Node):
+	if not what is PurchasableItem:
+		push_error("Purchase succeeded outside a PurchasableItem")
+		return
+	purchase_success.emit(what)
+	for item in purchasable_items:
+		if item == what:
+			continue
+		item.can_buy = true
+
+func _on_score_button_pressed():
+	score_button_pressed.emit()
+	
+func _on_delete_button_pressed():
+	delete_button_pressed.emit()
+
+func _on_back_button_pressed():
+	back_button_pressed.emit()
diff --git a/interface/shop_ui.tscn b/interface/shop_ui.tscn
new file mode 100644
index 0000000..279e6f3
--- /dev/null
+++ b/interface/shop_ui.tscn
@@ -0,0 +1,181 @@
+[gd_scene load_steps=5 format=3 uid="uid://cklkdygv61bny"]
+
+[ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="1_qdf0y"]
+[ext_resource type="PackedScene" uid="uid://dul1fpyh733t7" path="res://interface/purchasable_item.tscn" id="2_2dtc0"]
+[ext_resource type="Script" path="res://interface/shop_ui.gd" id="2_iyr7m"]
+[ext_resource type="PackedScene" uid="uid://wodgj6rp2ewm" path="res://interface/purchasable_item_padding.tscn" id="3_4feaj"]
+
+[node name="ShopUI" type="Panel"]
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+theme = ExtResource("1_qdf0y")
+script = ExtResource("2_iyr7m")
+
+[node name="Rows" type="VBoxContainer" parent="."]
+layout_mode = 1
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+
+[node name="UpperButtons" type="HBoxContainer" parent="Rows"]
+custom_minimum_size = Vector2(0, 54)
+layout_mode = 2
+
+[node name="ScoreButton" type="Button" parent="Rows/UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 0
+text = "$0"
+alignment = 0
+
+[node name="UpperButtonsSpacerLeft" type="Control" parent="Rows/UpperButtons"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="DeleteButton" type="Button" parent="Rows/UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 4
+text = "Del"
+
+[node name="UpperButtonsSpacerRight" type="Control" parent="Rows/UpperButtons"]
+layout_mode = 2
+size_flags_horizontal = 3
+
+[node name="BackButton" type="Button" parent="Rows/UpperButtons"]
+custom_minimum_size = Vector2(72, 0)
+layout_mode = 2
+size_flags_horizontal = 8
+text = "Back"
+alignment = 2
+
+[node name="Scrollable" type="ScrollContainer" parent="Rows"]
+layout_mode = 2
+size_flags_vertical = 3
+horizontal_scroll_mode = 0
+vertical_scroll_mode = 2
+
+[node name="ScrollableItems" type="VBoxContainer" parent="Rows/Scrollable"]
+layout_mode = 2
+size_flags_horizontal = 3
+size_flags_vertical = 3
+
+[node name="ConvertCategory" type="VBoxContainer" parent="Rows/Scrollable/ScrollableItems"]
+layout_mode = 2
+
+[node name="PurchasableItemPadding5" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="EarnCoinsLabel" type="Label" parent="Rows/Scrollable/ScrollableItems/ConvertCategory"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 24
+text = "Convert your coins"
+horizontal_alignment = 1
+vertical_alignment = 1
+autowrap_mode = 2
+uppercase = true
+
+[node name="PurchasableItemPadding3" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem2" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding2" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem3" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+has_unlocked = false
+
+[node name="PurchasableItemPadding4" parent="Rows/Scrollable/ScrollableItems/ConvertCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="ManualCategory" type="VBoxContainer" parent="Rows/Scrollable/ScrollableItems"]
+layout_mode = 2
+
+[node name="PurchasableItemPadding5" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="EarnCoinsLabel" type="Label" parent="Rows/Scrollable/ScrollableItems/ManualCategory"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 24
+text = "Automatic coin dropper"
+horizontal_alignment = 1
+vertical_alignment = 1
+autowrap_mode = 2
+uppercase = true
+
+[node name="PurchasableItemPadding3" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem2" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding2" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem3" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+has_unlocked = false
+
+[node name="PurchasableItemPadding4" parent="Rows/Scrollable/ScrollableItems/ManualCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="AutomaticCategory" type="VBoxContainer" parent="Rows/Scrollable/ScrollableItems"]
+layout_mode = 2
+
+[node name="PurchasableItemPadding5" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="EarnCoinsLabel" type="Label" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory"]
+layout_mode = 2
+theme_override_font_sizes/font_size = 24
+text = "Automatic coin dropper"
+horizontal_alignment = 1
+vertical_alignment = 1
+autowrap_mode = 2
+uppercase = true
+
+[node name="PurchasableItemPadding3" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem2" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+
+[node name="PurchasableItemPadding2" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[node name="PurchasableItem3" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("2_2dtc0")]
+layout_mode = 2
+has_unlocked = false
+
+[node name="PurchasableItemPadding4" parent="Rows/Scrollable/ScrollableItems/AutomaticCategory" instance=ExtResource("3_4feaj")]
+layout_mode = 2
+
+[connection signal="pressed" from="Rows/UpperButtons/ScoreButton" to="." method="_on_score_button_pressed"]
+[connection signal="pressed" from="Rows/UpperButtons/DeleteButton" to="." method="_on_delete_button_pressed"]
+[connection signal="pressed" from="Rows/UpperButtons/BackButton" to="." method="_on_back_button_pressed"]
diff --git a/random/randomizer.gd b/random/randomizer.gd
new file mode 100644
index 0000000..1446f43
--- /dev/null
+++ b/random/randomizer.gd
@@ -0,0 +1,3 @@
+extends Node
+class_name Randomizer
+static var rng : RandomNumberGenerator = RandomNumberGenerator.new()
diff --git a/random/randomizer.tscn b/random/randomizer.tscn
new file mode 100644
index 0000000..d199a94
--- /dev/null
+++ b/random/randomizer.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://cldl3smm1c2pm"]
+
+[ext_resource type="Script" path="res://random/randomizer.gd" id="1_nvy1v"]
+
+[node name="Randomizer" type="Node"]
+script = ExtResource("1_nvy1v")
diff --git a/random/roller.gd b/random/roller.gd
new file mode 100644
index 0000000..07587c0
--- /dev/null
+++ b/random/roller.gd
@@ -0,0 +1,14 @@
+extends Node2D
+
+@export_range(0,1) var slider : float = 0
+
+signal success()
+
+signal failure()
+
+func roll():
+	if Randomizer.rng.randf() < slider:
+		success.emit()
+	else:
+		failure.emit()
+
diff --git a/random/roller.tscn b/random/roller.tscn
new file mode 100644
index 0000000..7c34586
--- /dev/null
+++ b/random/roller.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://dvgxb0ichkoe7"]
+
+[ext_resource type="Script" path="res://random/roller.gd" id="1_vetpi"]
+
+[node name="Roller" type="Node2D"]
+script = ExtResource("1_vetpi")
diff --git a/root.gd b/root.gd
new file mode 100644
index 0000000..9ba5ed7
--- /dev/null
+++ b/root.gd
@@ -0,0 +1,53 @@
+extends Node
+class_name Root
+
+
+@onready var tree: SceneTree = get_tree()
+@onready var game: Game = $UI/GameContainer/Game
+@onready var game_ui: GameUI = $UI/GameUI
+@onready var shop_ui: ShopUI = $UI/ShopUI
+
+
+enum UIState {
+	GAME,
+	SHOP,
+	SCORE,
+}
+
+@export var ui_state: UIState:
+	get:
+		return ui_state
+	set(value):
+		match value:
+			UIState.GAME:
+				tree.paused = false
+				game_ui.show()
+				shop_ui.hide()
+			UIState.SHOP:
+				tree.paused = true
+				game_ui.hide()
+				shop_ui.show()
+			UIState.SCORE:
+				pass
+
+
+func _on_game_ui_score_button_pressed():
+	ui_state = UIState.SCORE
+
+func _on_shop_ui_back_button_pressed():
+	ui_state = UIState.GAME
+
+func _on_shop_ui_delete_button_pressed():
+	ui_state = UIState.GAME
+
+func _on_shop_ui_score_button_pressed():
+	ui_state = UIState.SCORE
+
+func _on_game_ui_shop_button_pressed():
+	ui_state = UIState.SHOP
+
+func _on_game_ui_spawn_button_pressed():
+	game.trigger_spawn()
+
+func _on_shop_ui_purchase_begin(_what):
+	ui_state = UIState.GAME
diff --git a/root.tscn b/root.tscn
index 640da11..46ff088 100644
--- a/root.tscn
+++ b/root.tscn
@@ -1,13 +1,16 @@
-[gd_scene load_steps=5 format=3 uid="uid://cbccs6kwwf265"]
+[gd_scene load_steps=6 format=3 uid="uid://cbccs6kwwf265"]
 
-[ext_resource type="PackedScene" uid="uid://bllsprv8orpn4" path="res://bottle/bottle.tscn" id="1_4fmd3"]
-[ext_resource type="PackedScene" uid="uid://c3kitncwpi42j" path="res://entity/coin_copper.tscn" id="2_dv01l"]
-[ext_resource type="PackedScene" path="res://bottle/gravity_from_gyro.tscn" id="2_m7p4p"]
-[ext_resource type="PackedScene" uid="uid://c67lfbk4gf1ga" path="res://spawner/spawner.tscn" id="3_pubxn"]
+[ext_resource type="Script" path="res://root.gd" id="1_8jrhk"]
+[ext_resource type="Theme" uid="uid://ba5utvfhnxa5i" path="res://interface/interface_theme.tres" id="1_h26ax"]
+[ext_resource type="PackedScene" uid="uid://c3rxmcwa5nqng" path="res://game/game.tscn" id="3_hrdyr"]
+[ext_resource type="PackedScene" uid="uid://cklkdygv61bny" path="res://interface/shop_ui.tscn" id="3_lvefk"]
+[ext_resource type="PackedScene" uid="uid://bo5unrhqpoyim" path="res://interface/game_ui.tscn" id="5_2cc15"]
 
 [node name="Root" type="Node"]
+script = ExtResource("1_8jrhk")
 
 [node name="UI" type="Control" parent="."]
+texture_filter = 1
 layout_mode = 3
 anchors_preset = 15
 anchor_right = 1.0
@@ -15,53 +18,10 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 2
 size_flags_vertical = 8
-
-[node name="Rows" type="VBoxContainer" parent="UI"]
-layout_mode = 1
-anchors_preset = 15
-anchor_right = 1.0
-anchor_bottom = 1.0
-grow_horizontal = 2
-grow_vertical = 2
-
-[node name="NotchSpacer" type="PanelContainer" parent="UI/Rows"]
-layout_mode = 2
-size_flags_horizontal = 3
-
-[node name="UpperButtons" type="HBoxContainer" parent="UI/Rows"]
-custom_minimum_size = Vector2(0, 54)
-layout_mode = 2
-size_flags_vertical = 8
-
-[node name="MoneyButton" type="Button" parent="UI/Rows/UpperButtons"]
-custom_minimum_size = Vector2(54, 0)
-layout_mode = 2
-size_flags_horizontal = 8
-text = "$0"
-alignment = 0
-
-[node name="UpperButtonsSpacerLeft" type="PanelContainer" parent="UI/Rows/UpperButtons"]
-layout_mode = 2
-size_flags_horizontal = 3
-
-[node name="SpawnButton" type="Button" parent="UI/Rows/UpperButtons"]
-custom_minimum_size = Vector2(54, 0)
-layout_mode = 2
-size_flags_horizontal = 8
-text = "Drop"
-
-[node name="UpperButtonsSpacerRight" type="PanelContainer" parent="UI/Rows/UpperButtons"]
-layout_mode = 2
-size_flags_horizontal = 3
-
-[node name="ShopButton" type="Button" parent="UI/Rows/UpperButtons"]
-custom_minimum_size = Vector2(54, 0)
-layout_mode = 2
-size_flags_horizontal = 8
-text = "Shop"
-alignment = 2
+theme = ExtResource("1_h26ax")
 
 [node name="GameContainer" type="Control" parent="UI"]
+process_mode = 1
 layout_mode = 1
 anchors_preset = 7
 anchor_left = 0.5
@@ -71,14 +31,21 @@ anchor_bottom = 1.0
 grow_horizontal = 2
 grow_vertical = 0
 
-[node name="Game" type="Node2D" parent="UI/GameContainer"]
-texture_filter = 1
+[node name="Game" parent="UI/GameContainer" instance=ExtResource("3_hrdyr")]
 
-[node name="Bottle" parent="UI/GameContainer/Game" instance=ExtResource("1_4fmd3")]
+[node name="GameUI" parent="UI" instance=ExtResource("5_2cc15")]
+process_mode = 3
+layout_mode = 1
 
-[node name="GravityFromGyro" parent="UI/GameContainer/Game/Bottle" instance=ExtResource("2_m7p4p")]
+[node name="ShopUI" parent="UI" instance=ExtResource("3_lvefk")]
+process_mode = 3
+visible = false
+layout_mode = 1
 
-[node name="Spawner" parent="UI/GameContainer/Game" instance=ExtResource("3_pubxn")]
-position = Vector2(0, -400)
-scene = ExtResource("2_dv01l")
-target_parent = NodePath("..")
+[connection signal="score_button_pressed" from="UI/GameUI" to="." method="_on_game_ui_score_button_pressed"]
+[connection signal="shop_button_pressed" from="UI/GameUI" to="." method="_on_game_ui_shop_button_pressed"]
+[connection signal="spawn_button_pressed" from="UI/GameUI" to="." method="_on_game_ui_spawn_button_pressed"]
+[connection signal="back_button_pressed" from="UI/ShopUI" to="." method="_on_shop_ui_back_button_pressed"]
+[connection signal="delete_button_pressed" from="UI/ShopUI" to="." method="_on_shop_ui_delete_button_pressed"]
+[connection signal="purchase_begin" from="UI/ShopUI" to="." method="_on_shop_ui_purchase_begin"]
+[connection signal="score_button_pressed" from="UI/ShopUI" to="." method="_on_shop_ui_score_button_pressed"]
diff --git a/score/scoreboard.gd b/score/scoreboard.gd
new file mode 100644
index 0000000..d822fd5
--- /dev/null
+++ b/score/scoreboard.gd
@@ -0,0 +1,14 @@
+extends Control
+
+class_name ScoreBoard
+
+@export var score: int = 0
+
+func _ready():
+	$Label.text = "Score: " + str(score)
+
+func _process(delta):
+	pass
+
+func _on_evaluator_score_changed(total_value):
+	$Label.text = "Score: " + str(total_value)
diff --git a/score/scoreboard.tscn b/score/scoreboard.tscn
new file mode 100644
index 0000000..659e8e6
--- /dev/null
+++ b/score/scoreboard.tscn
@@ -0,0 +1,23 @@
+[gd_scene load_steps=2 format=3 uid="uid://bokcnc0q0qqj3"]
+
+[ext_resource type="Script" path="res://score/scoreboard.gd" id="1_of77n"]
+
+[node name="Control" type="Control"]
+layout_mode = 3
+anchors_preset = 15
+anchor_right = 1.0
+anchor_bottom = 1.0
+grow_horizontal = 2
+grow_vertical = 2
+script = ExtResource("1_of77n")
+
+[node name="Label" type="Label" parent="."]
+layout_mode = 0
+offset_right = 40.0
+offset_bottom = 23.0
+text = "SCORE: "
+
+[node name="VSlider" type="VSlider" parent="."]
+layout_mode = 0
+offset_right = 16.0
+offset_bottom = 8.0
diff --git a/spawner/spawner.gd b/spawner/spawner.gd
index 1cc21d5..8e6a5f1 100644
--- a/spawner/spawner.gd
+++ b/spawner/spawner.gd
@@ -1,11 +1,55 @@
 extends Node2D
 class_name Spawner
+
+
 @export var scene: PackedScene
-@export var target_parent: NodePath
+
+var buffer: int = 0
+@export var buffer_cap: int
+
+@onready var area: Area2D = $Area
+
+@export var spawn_position_range_x: float
+@export_range(0, 90) var spawn_rotation_range: float
+@onready var rng: RandomNumberGenerator = RandomNumberGenerator.new()
+
+@export_flags_2d_physics var overlapping_bodies_collision_mask: int
+@export_range(0, 16) var overlapping_body_count_limit: int
+
+signal spawned(what: Node2D)
+
 
 func spawn():
-	if len($Area2D.get_overlapping_bodies()) > 0:
+	buffer += 1
+	if buffer > buffer_cap:
+		buffer = buffer_cap
+
+func _count_overlapping_bodies() -> int:
+	var overlapping_bodies = area.get_overlapping_bodies()
+	var overlapping_body_count = 0
+	for overlapping_body in overlapping_bodies:
+		if overlapping_body.collision_layer & overlapping_bodies_collision_mask:
+			overlapping_body_count += 1
+	return overlapping_body_count
+
+
+func _select_spawn_position() -> Vector2:
+	return Vector2(rng.randf_range(-spawn_position_range_x, +spawn_position_range_x), 0)
+
+func _select_spawn_rotation() -> float:
+	return rng.randf_range(-spawn_rotation_range, spawn_rotation_range)
+
+func _do_spawn():
+	if _count_overlapping_bodies() > overlapping_body_count_limit:
 		return
 	var scene_instant = scene.instantiate()
-	scene_instant.position=Vector2.ZERO
+	scene_instant.position = _select_spawn_position()
+	scene_instant.rotation_degrees = _select_spawn_rotation()
 	add_child(scene_instant)
+	emit_signal("spawned", scene_instant)
+	buffer -= 1
+
+
+func _physics_process(_delta):
+	if buffer > 0:
+		_do_spawn()
diff --git a/spawner/spawner.tscn b/spawner/spawner.tscn
index b97d4f9..fb79f06 100644
--- a/spawner/spawner.tscn
+++ b/spawner/spawner.tscn
@@ -2,21 +2,14 @@
 
 [ext_resource type="Script" path="res://spawner/spawner.gd" id="1_xqfmg"]
 
-[sub_resource type="RectangleShape2D" id="RectangleShape2D_xnebx"]
-size = Vector2(100, 20)
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_p13i4"]
+size = Vector2(96, 96)
 
 [node name="Spawner" type="Node2D"]
 script = ExtResource("1_xqfmg")
 
-[node name="Timer" type="Timer" parent="."]
-wait_time = 0.1
-autostart = true
-
-[node name="Area2D" type="Area2D" parent="."]
+[node name="Area" type="Area2D" parent="."]
 collision_mask = 4
 
-[node name="Shape" type="CollisionShape2D" parent="Area2D"]
-position = Vector2(0, -15)
-shape = SubResource("RectangleShape2D_xnebx")
-
-[connection signal="timeout" from="Timer" to="." method="spawn"]
+[node name="Shape" type="CollisionShape2D" parent="Area"]
+shape = SubResource("RectangleShape2D_p13i4")
diff --git a/value/evaluator.gd b/value/evaluator.gd
new file mode 100644
index 0000000..62040fb
--- /dev/null
+++ b/value/evaluator.gd
@@ -0,0 +1,39 @@
+extends Area2D
+class_name Evaluator
+## aggiunge al totale i valori dei Valuable che ci body_enterano e sottrae quelli che ci body_exitano
+
+
+## The current amount of value evaluated.
+var total_value: int = 0
+
+## The types of [Collectible]s to value.
+##
+## The strings will match only if exactly the same.
+#@export var collecting_types: Array[StringName]
+
+## The collision mask to check colliding body against.
+@export_flags_2d_physics var collecting_collision_mask: int
+
+## The evaluator has added the value of an object to the total.
+signal added(what: PhysicsBody2D, total_value: int)
+## The evaluator has removed the value of an object to the total.
+signal removed(what: PhysicsBody2D)
+
+signal score_changed(total_value: int)
+
+func _on_body_entered(body):
+	if body is PhysicsBody2D:
+		if body.collision_layer & collecting_collision_mask:
+			var evaluable: Valuable = body.get_node("Valuable")
+			total_value += evaluable.value
+			evaluable.evaluate()
+			score_changed.emit(total_value)
+			
+func _on_body_exited(body):
+	if body is PhysicsBody2D:
+		if body.collision_layer & collecting_collision_mask:
+			var evaluable: Valuable = body.get_node("Valuable")
+			total_value -= evaluable.value
+			evaluable.evaluate()
+			score_changed.emit(total_value)
+
diff --git a/value/evaluator.tscn b/value/evaluator.tscn
new file mode 100644
index 0000000..e797c93
--- /dev/null
+++ b/value/evaluator.tscn
@@ -0,0 +1,9 @@
+[gd_scene load_steps=2 format=3 uid="uid://beg758fa6o0cs"]
+
+[ext_resource type="Script" path="res://value/evaluator.gd" id="1_sjx78"]
+
+[node name="Evaluator" type="Area2D"]
+script = ExtResource("1_sjx78")
+
+[connection signal="body_entered" from="." to="." method="_on_body_entered"]
+[connection signal="body_exited" from="." to="." method="_on_body_exited"]
diff --git a/value/valuable.gd b/value/valuable.gd
new file mode 100644
index 0000000..ef50710
--- /dev/null
+++ b/value/valuable.gd
@@ -0,0 +1,13 @@
+extends Node
+class_name Valuable
+
+@export var value: int
+
+## Emitted when this entity has been counted.
+signal evaluated
+
+## Mark this entity as evaluated.
+##
+func evaluate():
+	emit_signal("evaluated")
+
diff --git a/value/valuable.tscn b/value/valuable.tscn
new file mode 100644
index 0000000..6a66261
--- /dev/null
+++ b/value/valuable.tscn
@@ -0,0 +1,6 @@
+[gd_scene load_steps=2 format=3 uid="uid://ujpra0s1kpqi"]
+
+[ext_resource type="Script" path="res://value/valuable.gd" id="1_mr62g"]
+
+[node name="Valuable" type="Node2D"]
+script = ExtResource("1_mr62g")