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Weird Overlapping Squares

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I am writing an isometric game engine like the one in Diablo2, but I have ran into a snag that''s really frustrating! To speed up the engine I only update areas of the screen that have changed recently. This keeps my game from running like a snail. The only problem is that when a wall occludes a tile that will be updated, the tile is drawn over top of the wall! Does anyone know how to get around this without slowing the game down too much?

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