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The Game Boy Micro retains some of the functionality of the Game Boy Advance SP, but with a more compact form factor. It cannot play original Game Boy and Game Boy Color games due to design changes. Although it still has the required LR35902 processor and graphics hardware necessary to run games from older Game Boy systems, it lacks other internal hardware necessary for backward compatibility. It is incompatible with the Nintendo e-Reader and other peripherals due to similar design issues. Additionally, it has a backlit screen with the ability to adjust the brightness. The shape itself is oblong, similar to the style of the Nintendo Entertainment System controller.