It was bound to happen. Since Nintendo's Gameboy Advance has no backlight, there have been several add-ons available since day-one (not to mention all the existing Gameboy Color lights).

Adam Curtis has found a way to install white LEDs in the GBA for lighting, and it proves that Nintendo could have done it very cheaply. So why didn't they? I guess all those third-party lights add up to a lot of licencing fees eh?

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