diff --git a/audio/conversione/coal_funny.wav b/audio/conversione/coal_funny.wav
new file mode 100644
index 0000000..29cf459
--- /dev/null
+++ b/audio/conversione/coal_funny.wav
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:655deb023ea3e650bee4021b5d6cec8b431c5e02bf123d6b3aab03c4ce98b6a9
+size 1382488
diff --git a/entity/coal_diamond/coal.tscn b/entity/coal_diamond/coal.tscn
index a719446..7416c8b 100644
--- a/entity/coal_diamond/coal.tscn
+++ b/entity/coal_diamond/coal.tscn
@@ -8,8 +8,8 @@
 [node name="Coal" type="RigidBody2D"]
 collision_layer = 4
 collision_mask = 14
-mass = 2.0
-inertia = 600.0
+mass = 0.75
+inertia = 1200.0
 physics_material_override = ExtResource("1_ftt7x")
 continuous_cd = 1
 can_sleep = false
diff --git a/entity/coal_diamond/diamond.tscn b/entity/coal_diamond/diamond.tscn
index 681503f..2de7878 100644
--- a/entity/coal_diamond/diamond.tscn
+++ b/entity/coal_diamond/diamond.tscn
@@ -9,8 +9,8 @@
 [node name="Diamond" type="RigidBody2D"]
 collision_layer = 4
 collision_mask = 14
-mass = 2.0
-inertia = 600.0
+mass = 3.0
+inertia = 400.0
 physics_material_override = ExtResource("1_mma75")
 continuous_cd = 1
 can_sleep = false
diff --git a/entity/coin_copper/coin_copper.tscn b/entity/coin_copper/coin_copper.tscn
index 9297f4b..def0919 100644
--- a/entity/coin_copper/coin_copper.tscn
+++ b/entity/coin_copper/coin_copper.tscn
@@ -5,7 +5,7 @@
 [ext_resource type="Texture2D" uid="uid://2vtvoj6ua3cb" path="res://entity/coin_copper/coin_copper_outline_2.png" id="3_dq1f7"]
 [ext_resource type="PackedScene" uid="uid://bk1vvq5rug01m" path="res://collector/collectible.tscn" id="4_npwn2"]
 [ext_resource type="PackedScene" uid="uid://ujpra0s1kpqi" path="res://value/valuable.tscn" id="5_fd0r7"]
-[ext_resource type="AudioStream" uid="uid://wy7f2j0wg1ur" path="res://audio/tap/click5.wav" id="7_fxd28"]
+[ext_resource type="AudioStream" uid="uid://ds2rl6eg5jr1" path="res://audio/tap/click5.wav" id="7_fxd28"]
 
 [sub_resource type="RectangleShape2D" id="RectangleShape2D_c6byl"]
 size = Vector2(14, 3)
@@ -16,8 +16,6 @@ collision_mask = 14
 inertia = 1000.0
 physics_material_override = ExtResource("1_1fypc")
 continuous_cd = 1
-max_contacts_reported = 1
-contact_monitor = true
 can_sleep = false
 linear_damp = 0.1
 angular_damp = 0.1
diff --git a/entity/gem/gem.tscn b/entity/gem/gem.tscn
index e4cc75d..c332612 100644
--- a/entity/gem/gem.tscn
+++ b/entity/gem/gem.tscn
@@ -16,8 +16,8 @@ height = 9.0
 [node name="Gem" type="RigidBody2D"]
 collision_layer = 4
 collision_mask = 14
-mass = 1.5
-inertia = 800.0
+mass = 2.5
+inertia = 500.0
 physics_material_override = ExtResource("1_vmemd")
 continuous_cd = 1
 can_sleep = false
diff --git a/entity/item/item_chalice.tscn b/entity/item/item_chalice.tscn
index 684a80d..6b910b5 100644
--- a/entity/item/item_chalice.tscn
+++ b/entity/item/item_chalice.tscn
@@ -15,8 +15,8 @@
 [node name="ItemChalice" type="RigidBody2D"]
 collision_layer = 5
 collision_mask = 7
-mass = 1.5
-inertia = 800.0
+mass = 2.7
+inertia = 450.0
 physics_material_override = ExtResource("1_vp2el")
 continuous_cd = 1
 linear_damp = 0.1
diff --git a/entity/item/item_crown.tscn b/entity/item/item_crown.tscn
index fcafaaa..713528a 100644
--- a/entity/item/item_crown.tscn
+++ b/entity/item/item_crown.tscn
@@ -17,8 +17,8 @@ height = 32.0
 [node name="ItemCrown" type="RigidBody2D"]
 collision_layer = 5
 collision_mask = 7
-mass = 1.5
-inertia = 800.0
+mass = 2.8
+inertia = 425.0
 physics_material_override = ExtResource("1_j1ug7")
 continuous_cd = 1
 linear_damp = 0.1
diff --git a/entity/item/item_ring.tscn b/entity/item/item_ring.tscn
index 5a199ce..d27d398 100644
--- a/entity/item/item_ring.tscn
+++ b/entity/item/item_ring.tscn
@@ -17,8 +17,8 @@ height = 17.01
 [node name="ItemRing" type="RigidBody2D"]
 collision_layer = 5
 collision_mask = 7
-mass = 1.5
-inertia = 800.0
+mass = 2.6
+inertia = 475.0
 physics_material_override = ExtResource("1_yyeot")
 continuous_cd = 1
 linear_damp = 0.1