diff --git a/isometric-park-fna/Engines/BuildToolEngine.cs b/isometric-park-fna/Engines/BuildToolEngine.cs
--- a/isometric-park-fna/Engines/BuildToolEngine.cs
+++ b/isometric-park-fna/Engines/BuildToolEngine.cs
@@ -142,7 +142,9 @@
                                 foreach (var i in step_until(area.squares[0].X, end_x)) {
                                     foreach (var j in step_until(area.squares[0].Y, end_y)) {
                                         var newSquare = new Vector2(i, j);
-                                        newSquares.Add(newSquare);
+                                        if (!occupied.Contains(newSquare)) {
+                                            newSquares.Add(newSquare);
+                                        }
                                     }
                                 }
 
diff --git a/isometric-park-fna/FNAGame.cs b/isometric-park-fna/FNAGame.cs
--- a/isometric-park-fna/FNAGame.cs
+++ b/isometric-park-fna/FNAGame.cs
@@ -194,7 +194,7 @@
         this.tileBatch = new SpriteBatch(GraphicsDevice);
 
 // #if DEBUG
-        SoundEffectEngine.LoadSound(Content, "FNASound");
+        this.sound = SoundEffectEngine.LoadSound(Content, "FNASound");
         SoundEffectEngine.LoadSound(Content, "Click");
         SoundEffectEngine.LoadSound(Content, "ClickPart1");
         SoundEffectEngine.LoadSound(Content, "ClickPart2");