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Array-Backed Grid

If you work with grids much, you'll find this to be slow. You may want to look at:

array_backed_grid_buffered - faster and uses buffered shapes
array_backed_grid_sprites_1 - super-fast and uses sprites. Resyncs to number grid in one function call
array_backed_grid_sprites_2 super-fast and uses sprites. Keeps a second 2D grid of sprites to match 2D grid of numbers

../../arcade/examples/array_backed_grid.py