diff --git a/Scripts/Level.cs b/Scripts/Level.cs
index 8903527..75910b8 100644
--- a/Scripts/Level.cs
+++ b/Scripts/Level.cs
@@ -41,10 +41,12 @@ public class Level {
     }
 
     public void WritePixel(int x, int y, int size) {
-        for (int i = -size/2; i < size/2; i++) {
-            for (int j = -size/2; j < size/2; j++) {
-                int X = Mathf.Clamp(x + i, 0, SizeX);
-                int Y = Mathf.Clamp(y + j, 0, SizeY);
+        int halfsize = size/2;
+
+        for (int i = -halfsize; i <= halfsize; i++) {
+            for (int j = -halfsize; j <= halfsize; j++) {
+                int X = Mathf.Clamp(x + i, 0, SizeX-1);
+                int Y = Mathf.Clamp(y + j, 0, SizeY-1);
                 _elements[X,Y] = new Dirt(X, Y, ref _this);
             }
         }