diff --git a/Assets/Scripts/GameManager.cs b/Assets/Scripts/GameManager.cs
index f2d7ce7..3cc7ada 100644
--- a/Assets/Scripts/GameManager.cs
+++ b/Assets/Scripts/GameManager.cs
@@ -15,11 +15,12 @@ public class GameManager : MonoBehaviour
     public Transform NodeParent;
     public GameObject NodePrefab;
 
-    [HideInInspector] public static GameManager instance;
+    [HideInInspector] public static GameManager Instance { get; private set; }
 
     [HideInInspector] public float maxConnectionLength = 6;
     [HideInInspector] public int nodeCount = 100;
-    [HideInInspector] public int hoverRadius = 50;
+    [HideInInspector] public int hoverRadiusCon = 50;
+    [HideInInspector] public int hoverRadiusNode = 50;
 
     [SerializeField]
     [HideInInspector] public List<Connection> connections = new List<Connection>();
@@ -34,7 +35,30 @@ public class GameManager : MonoBehaviour
         public LineRenderer lineRenderer;
     }
 
+    void Start()
+    {
+        if (Instance != null && Instance != this)
+        {
+            if (Application.isPlaying)
+                Destroy(gameObject);
+            return;
+        }
 
+        Instance = this;
+        if (Application.isPlaying)
+            DontDestroyOnLoad(gameObject);
+
+    }
+
+#if UNITY_EDITOR
+    void OnEnable()
+    {
+        if (Instance == null)
+            Instance = this;
+        else if (Instance != this)
+            DestroyImmediate(gameObject);
+    }
+#endif
 
     public void GenerateAlongSphere()
     {
@@ -117,6 +141,12 @@ public class GameManager : MonoBehaviour
     {
         foreach (var con in connections)
         {
+            if(Application.isPlaying && !con.allowed)
+            {
+                con.lineRenderer.enabled = false;
+                continue;
+            }
+
             float width = (con.hovered ? 0.6f : 0.3f) * (con.allowed ? 1f : 0.3f);
 
             con.lineRenderer.startColor = con.allowed ? con.nodeA.transform.GetChild(0).GetComponent<Renderer>().sharedMaterial.color : new Color(0.2f, 0.2f, 0.2f);
@@ -156,7 +186,8 @@ public class GameManagerEditor : Editor
         GUILayout.Space(10);
         GUILayout.Label("Connection Gizmos", EditorStyles.boldLabel);
         
-        gm.hoverRadius = EditorGUILayout.IntSlider("Hover Radius", gm.hoverRadius, 0, 100);
+        gm.hoverRadiusCon = EditorGUILayout.IntSlider("Hover Radius (Connection)", gm.hoverRadiusCon, 0, 100);
+        gm.hoverRadiusNode = EditorGUILayout.IntSlider("Hover Radius (Node)", gm.hoverRadiusNode, 0, 100);
 
 
 
@@ -184,11 +215,28 @@ public class GameManagerEditor : Editor
 
         GUILayout.EndHorizontal(); 
     }
+
     private void OnSceneGUI()
     {
         Handles.zTest = UnityEngine.Rendering.CompareFunction.LessEqual;
 
-        GameManager gm = (GameManager)target;
+        GameManager gm = GameManager.Instance;
+        if (gm == null) return;
+
+        GameObject selected = Selection.activeGameObject;
+        bool allowHover = false;
+
+        if (selected == gm.gameObject)
+            allowHover = true;
+        else
+        {
+            Node node = selected?.GetComponent<Node>();
+            if (node != null && gm.nodes.Contains(node))
+                allowHover = true;
+        }
+
+        if (!allowHover) return;
+
         if (gm.connections == null || gm.connections.Count == 0) return;
         Camera cam = SceneView.lastActiveSceneView.camera;
         if (cam == null) return;
@@ -199,12 +247,16 @@ public class GameManagerEditor : Editor
 
         int closestIdx = -1;
         float closestDist = float.MaxValue;
+        bool cancelHover = false;
 
-        // Hover-Ermittlung
+        // Hover-Ermittlung Connections
         for (int i = 0; i < gm.connections.Count; i++)
         {
             gm.connections[i].hovered = false;
 
+            if (cancelHover)
+                continue;
+            
             var con = gm.connections[i];
             Vector3 a = cam.WorldToScreenPoint(con.nodeA.transform.position);
             Vector3 b = cam.WorldToScreenPoint(con.nodeB.transform.position);
@@ -215,14 +267,21 @@ public class GameManagerEditor : Editor
             Vector3 proj = a + t * ab;
             float dist = Vector3.Distance(mousePos, proj);
 
-            if (dist < closestDist && dist < gm.hoverRadius)
+            if (Vector3.Distance(a, mousePos) <= gm.hoverRadiusNode || Vector3.Distance(b, mousePos) <= gm.hoverRadiusNode)
+                cancelHover = true;
+
+            if (dist < closestDist && dist < gm.hoverRadiusCon)
             {
                 closestDist = dist;
                 closestIdx = i;
             }
         }
 
-        if(closestIdx >= 0)
+        if (closestIdx < 0)
+            cancelHover = true;
+
+
+        if (!cancelHover)
             gm.connections[closestIdx].hovered = true;
 
 
@@ -230,14 +289,14 @@ public class GameManagerEditor : Editor
         Event e = Event.current;
 
 
-        if (e.type == EventType.MouseDown && e.button == 0 && closestIdx >= 0) 
+        if (e.type == EventType.MouseDown && e.button == 0 && !cancelHover) 
         {
             clickedConIdx = closestIdx;
         }
 
         if (e.type == EventType.MouseUp && e.button == 0)
         {
-            if (closestIdx == clickedConIdx && closestIdx != -1)
+            if (closestIdx == clickedConIdx && !cancelHover)
             {
                 gm.connections[closestIdx].allowed = !gm.connections[closestIdx].allowed;
                 e.Use(); // Event als verarbeitet markieren
diff --git a/Assets/Scripts/Node.cs b/Assets/Scripts/Node.cs
index e73a3ba..a880849 100644
--- a/Assets/Scripts/Node.cs
+++ b/Assets/Scripts/Node.cs
@@ -30,9 +30,5 @@ public class Node : MonoBehaviour
         }
         
     }
-
-    private void OnMouseDown()
-    {
-        Owner = Owner >= 1 ? -1 : Owner + 1;
-    }
+
 }