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
@@ -44,7 +44,6 @@
 	private int aiScore = 0;
 
 	//new tile stuff
-	TileMap myMap = new TileMap();
 	int squaresAcross = 50;
 	int squaresDown = 50;
 	int baseOffsetX = -14;
@@ -54,6 +53,9 @@
 
 	TileMap map;
 
+	Vector2 mouseGrid;
+	Vector2 original_point;
+
 
 	private static void Main(string[] args)
 	{
@@ -155,6 +157,52 @@
 		music.Dispose();
 	}
 
+	Vector2 calculateMousegrid(Vector2 normalizedMousePos)
+    {
+		int gridx = (int)((normalizedMousePos.X  ) / Tile.TileWidth);
+		int gridy = (int)((normalizedMousePos.Y + (2*baseOffsetY)) / (Tile.TileStepY));
+
+
+
+
+		int within_gridx = (int)(normalizedMousePos.X % Tile.TileWidth) - (Tile.TileWidth/2);
+		int within_gridy = (int)(normalizedMousePos.Y % Tile.TileHeight) - (Tile.TileHeight / 2);
+
+		int middle_distance = Math.Abs(within_gridx) + Math.Abs(within_gridx);
+		Vector2 adjustment_vector;
+
+		//return new Vector2(gridx, gridy);
+		if (middle_distance < (Tile.TileWidth / 2))
+		{
+			return new Vector2(gridx, gridy);
+		}
+
+		else if ((Math.Sign(within_gridx) == -1) && (Math.Sign(within_gridy) == 1))
+		{
+			adjustment_vector = new Vector2(-1, -1);
+			return new Vector2(gridx, gridy) + adjustment_vector;
+		}
+		else if ((Math.Sign(within_gridx) == -1) && (Math.Sign(within_gridy) == -1))
+		{
+			adjustment_vector = new Vector2(-1, 1);
+			return new Vector2(gridx, gridy) + adjustment_vector;
+		}
+		else if ((Math.Sign(within_gridx) == 1) && (Math.Sign(within_gridy) == 1))
+		{
+			adjustment_vector = new Vector2(0, -1);
+			return new Vector2(gridx, gridy) + adjustment_vector;
+		}
+		else if ((Math.Sign(within_gridx) == 1) && (Math.Sign(within_gridy) == -1))
+		{
+			adjustment_vector = new Vector2(0, 1);
+			return new Vector2(gridx, gridy) + adjustment_vector;
+		}
+		else {
+			return new Vector2(gridx, gridy);
+		}
+
+	}
+
 
 
 	protected override void Update(GameTime gameTime)
@@ -239,6 +287,18 @@
 			this.camera.Move(new Vector2(0, 4));
 		}
 
+		
+
+		this.original_point = Vector2.Transform(new Vector2(mouseCur.X, mouseCur.Y), Matrix.Invert(camera.get_transformation(GraphicsDevice)));
+
+		//int gridx = (int)((this.original_point.X-baseOffsetX) / Tile.TileStepX);
+		/* int gridx = (int)(this.original_point.Y / Tile.TileHeight + this.original_point.X / Tile.TileWidth); */
+		//int gridy = (int)((this.original_point.Y-baseOffsetY) / (Tile.TileStepY*2));
+		/* int gridy = (int)(this.original_point.Y / Tile.TileHeight - this.original_point.X / Tile.TileWidth); */
+
+		//this.mouseGrid = new Vector2(gridx, gridy);
+		this.mouseGrid = this.calculateMousegrid(this.original_point);
+
 		elapsedTime += gameTime.ElapsedGameTime;
 
 		if (elapsedTime > TimeSpan.FromSeconds(1))
@@ -341,6 +401,8 @@
 						Vector2.Zero,
 						SpriteEffects.None,
 						0.9f);
+
+				
             }
         }
 		
@@ -390,6 +452,9 @@
 		drawTileAt(0, 0, 22, 1);
 
 
+		drawTileAt((int)this.mouseGrid.X, (int)this.mouseGrid.Y, 2, 1);
+
+
 		/*
 
 		for (int i = 0; i< 80; i++)
@@ -420,7 +485,7 @@
 
 				if (this.map.cells[i][j].hasTree)
 				{
-					drawTileAt(i, j, 142, 2);
+					//drawTileAt(i, j, 142, 2);
 				}
 
 
@@ -448,6 +513,15 @@
 		batch.DrawString(font, this.map.tree_count.ToString(), new Vector2(330, 33), Color.Black, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.5f);
 		batch.DrawString(font, this.map.tree_count.ToString(), new Vector2(329, 32), Color.White, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.49f);
 
+
+		
+		batch.DrawString(font, this.mouseGrid.ToString(), new Vector2(360, 33), Color.Black, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.5f);
+		batch.DrawString(font, this.mouseGrid.ToString(), new Vector2(359, 32), Color.White, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.49f);
+		/*
+		batch.DrawString(font, this.original_point.ToString(), new Vector2(360, 33), Color.Black, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.5f);
+		batch.DrawString(font, this.original_point.ToString(), new Vector2(359, 32), Color.White, 0.0f, Vector2.Zero, 1.0f, SpriteEffects.None, 0.49f);
+		*/
+		//Matrix.Multiply()
 		batch.End();
 
 
@@ -458,4 +532,4 @@
 	}
 
 
-}
\ No newline at end of file
+}
diff --git a/isometric-park-fna/TileMap.cs b/isometric-park-fna/TileMap.cs
--- a/isometric-park-fna/TileMap.cs
+++ b/isometric-park-fna/TileMap.cs
@@ -15,6 +15,9 @@
         public int MapWidth = 50;
         public int MapHeight = 50;
 
+        public int ZoneWidth = 10;
+        public int ZoneHeight = 10;
+
         public int tree_count
         {
             get
@@ -67,6 +70,20 @@
             }
         }
 
+        public System.Collections.IEnumerable tree_cells(int zone)
+        {
+            foreach (List<Cell> row in cells)
+            {
+                foreach (Cell cell in row)
+                {
+                    if (cell.hasTree)
+                    {
+                        yield return cell;
+                    }
+                }
+            }
+        }
+
         public System.Collections.IEnumerable iterate_cells()
         {
             foreach (List<Cell> row in cells)