diff --git a/Assets/Components/Merge.cs b/Assets/Components/Merge.cs
index dbbdef7..2a451d1 100644
--- a/Assets/Components/Merge.cs
+++ b/Assets/Components/Merge.cs
@@ -7,6 +7,7 @@ public class Merge : MonoBehaviour
 {
     [Header("Config")]
     public GameObject mergeIntoPrefab;
+    public bool setMergedMassFromTotal;
 
     [Header("References")]
     protected new CircleCollider2D collider;
@@ -23,30 +24,42 @@ public class Merge : MonoBehaviour
 
     private void OnTriggerEnter2D(Collider2D other) {
         Merge otherMerge = other.GetComponent<Merge>();
-        mergeables.Add(otherMerge);
-
-        if(CanMerge()) DoMerge();
+        if(otherMerge != null) {
+            mergeables.Add(otherMerge);
+            if(CanMerge()) DoMerge();
+        }
     }
 
     private void OnTriggerExit2D(Collider2D other) {
         Merge otherMerge = other.GetComponent<Merge>();
-        mergeables.Remove(otherMerge);
+        if(otherMerge != null) {
+            mergeables.Remove(otherMerge);
+        }
     }
 
     protected bool CanMerge() {
-        return false;
+        return mergeables.Count >= 5;
     }
 
     protected void DoMerge() {
         GameObject mergeResult = Instantiate(mergeIntoPrefab, transform.position, Quaternion.identity);
         MergedInfo mergedInfo = mergeResult.AddComponent<MergedInfo>();
         mergedInfo.mergedCount = mergeables.Count;
-        foreach(Merge merged in mergeables) {
+
+        foreach(Merge merged in mergeables.ToArray()) {
             Rigidbody2D mergedBody = merged.GetComponentInParent<Rigidbody2D>();
             if(mergedBody != null) {
                 mergedInfo.mergedMass += mergedBody.mass;
             }
-            Destroy(merged.transform.parent);
+            Destroy(merged.transform.parent.gameObject);
+        }
+        
+        if(setMergedMassFromTotal) {
+            Rigidbody2D mergeRigidbody = mergeResult.GetComponent<Rigidbody2D>();
+            if(mergeRigidbody != null) {
+                mergeRigidbody.useAutoMass = false;
+                mergeRigidbody.mass = mergedInfo.mergedMass;
+            }
         }
     }
 }
diff --git a/Assets/Prefabs/Gravitation Object.prefab b/Assets/Prefabs/Gravitation Object.prefab
index ad6ac48..eeac4e8 100644
--- a/Assets/Prefabs/Gravitation Object.prefab	
+++ b/Assets/Prefabs/Gravitation Object.prefab	
@@ -13,7 +13,6 @@ GameObject:
   - component: {fileID: 5473375028011702753}
   - component: {fileID: 5473375028011702752}
   - component: {fileID: 5473375028011702755}
-  - component: {fileID: 720206987848026506}
   m_Layer: 0
   m_Name: Gravitation Object
   m_TagString: Untagged
@@ -31,7 +30,8 @@ Transform:
   m_LocalRotation: {x: 0, y: 0, z: 0, w: 1}
   m_LocalPosition: {x: -2, y: 0.88, z: 0}
   m_LocalScale: {x: 1, y: 1, z: 1}
-  m_Children: []
+  m_Children:
+  - {fileID: 851405983337701308}
   m_Father: {fileID: 0}
   m_RootOrder: 0
   m_LocalEulerAnglesHint: {x: 0, y: 0, z: 0}
@@ -135,17 +135,66 @@ MonoBehaviour:
   m_Name: 
   m_EditorClassIdentifier: 
   positionInList: 0
---- !u!114 &720206987848026506
+--- !u!1 &8635663089806839545
+GameObject:
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+  - component: {fileID: 392989897224966342}
+  - component: {fileID: 7106168952007636313}
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+  m_Name: MergeTrigger
+  m_TagString: Untagged
+  m_Icon: {fileID: 0}
+  m_NavMeshLayer: 0
+  m_StaticEditorFlags: 0
+  m_IsActive: 1
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+  m_Radius: 0.55
+--- !u!114 &7106168952007636313
 MonoBehaviour:
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   m_PrefabInstance: {fileID: 0}
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   m_Script: {fileID: 11500000, guid: 1010c8363cc1ebd4e9c1808f9a2737e2, type: 3}
   m_Name: 
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+  mergeIntoPrefab: {fileID: 5508245818244581766, guid: 81be647bed73a164cb47269e43863cac,
+    type: 3}
+  setMergedMassFromTotal: 1
diff --git a/Assets/Prefabs/Nothing.prefab b/Assets/Prefabs/Nothing.prefab
new file mode 100644
index 0000000..4e64710
--- /dev/null
+++ b/Assets/Prefabs/Nothing.prefab
@@ -0,0 +1,32 @@
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diff --git a/Assets/Prefabs/Nothing.prefab.meta b/Assets/Prefabs/Nothing.prefab.meta
new file mode 100644
index 0000000..747ca20
--- /dev/null
+++ b/Assets/Prefabs/Nothing.prefab.meta
@@ -0,0 +1,7 @@
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+PrefabImporter:
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diff --git a/Assets/Prefabs/Sun.prefab b/Assets/Prefabs/Sun.prefab
new file mode 100644
index 0000000..faa72b3
--- /dev/null
+++ b/Assets/Prefabs/Sun.prefab
@@ -0,0 +1,122 @@
+%YAML 1.1
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diff --git a/Assets/Prefabs/Sun.prefab.meta b/Assets/Prefabs/Sun.prefab.meta
new file mode 100644
index 0000000..156bf7d
--- /dev/null
+++ b/Assets/Prefabs/Sun.prefab.meta
@@ -0,0 +1,7 @@
+fileFormatVersion: 2
+guid: 81be647bed73a164cb47269e43863cac
+PrefabImporter:
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diff --git a/Assets/Scenes/Game.unity b/Assets/Scenes/Game.unity
index d9d2284..8c93692 100644
--- a/Assets/Scenes/Game.unity
+++ b/Assets/Scenes/Game.unity
@@ -121,140 +121,6 @@ NavMeshSettings:
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   m_NavMeshData: {fileID: 0}
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-  m_TagString: Untagged
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@@ -391,5 +257,10 @@ PrefabInstance:
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       value: 0
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