added method Tile.isSteppable() for obvious reasons...

cicaprojekt/Field.java

@@ -11,6 +11,13 @@ public class Field extends cicaprojekt.Tile {
         super();
     }
 
+    @Override
+    public boolean isSteppable() {
+        if (boxStack.isEmpty())
+            return true;
+
+        return false;
+    }
 
     @Override
     public void spawnStargate(cicaprojekt.Stargate stargate, Direction direction) {

cicaprojekt/Gap.java

@@ -5,6 +5,12 @@ public class Gap extends cicaprojekt.Tile {
         super();
     }
 
+    @Override
+    public boolean isSteppable()
+    {
+        return true;
+    }
+
     @Override
     public void spawnStargate(cicaprojekt.Stargate stargate, Direction direction) {
         adjacentTile.get(direction).spawnStargate(stargate, direction);

cicaprojekt/Gate.java

@@ -24,6 +24,15 @@ public class Gate extends Tile {
         }
     }
 
+    @Override
+    public boolean isSteppable()
+    {
+        if (open)
+            return true;
+
+        return false;
+    }
+
     public boolean isOpen() {
         return open;
     }

cicaprojekt/PlayerBase.java

@@ -32,12 +32,15 @@ public class PlayerBase implements Destroyable {
 
     public void move(Direction direction) {
         this.setFacingDirection(direction);
-        Tile tile = this.getCurrentTile().getAdjacentTile(direction);
+        Tile adjtile = this.getCurrentTile().getAdjacentTile(direction);
 
-        if (tile != null)
+        if (adjtile != null)
         {
-            tile.onEntry(this);
-            setCurrentTile(tile);
+            if (adjtile.isSteppable())
+            {
+                adjtile.onEntry(this);
+                setCurrentTile(adjtile);
+            }
         }
     }
 

cicaprojekt/Scale.java

@@ -14,6 +14,15 @@ public class Scale extends Field {
         boxStack = new Stack<Box>();
     }
 
+    @Override
+    public boolean isSteppable()
+    {
+        if (boxStack.isEmpty())
+            return true;
+
+        return false;
+    }
+
     @Override
     public void onEntry(PlayerBase playerBase) {
         gateConnected.setOpen(true);

cicaprojekt/Tile.java

@@ -31,6 +31,8 @@ public abstract class Tile {
             this.y = y;
     }
 
+    public abstract boolean isSteppable();
+
     public Tile getAdjacentTile(Direction direction) {
         return adjacentTile.get(direction);
     }

cicaprojekt/Wall.java

@@ -18,6 +18,14 @@ public class Wall extends Tile {
             return;
     }
 
+    @Override
+    public boolean isSteppable() {
+        if (sg != null)
+            return true;
+
+        return false;
+    }
+
     public void clearStargate() {
         if(sg != null) {
             sg.setCurrentWall(null);