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8x8 grid, what does it mean? is it 8x8 px squares to use in the art?.... Aaahhh time is ticking and i dont even know how to try to make the art

On the actual hardware, everything is made up of 8x8-pixel tiles. However, any multiple of 8 will work just fine on the real hardware as you can make them out of several 8x8 tiles. 16x16 is a good size to work with.

just ignore the whole 8x8 thing... the rest of us do not care.