Before going through the trouble of adding a backlight, there IS a brightness control pot on the AGB-001, on the back above the batteries is a long silver rectangular sticker, peel up the right side revealing a small hole. Stick in an eyeglass screwdriver and twist right. It gets brighter but not backlit bright, I still play mine outside in daylight. It’s healthier anyway. What they made the game “boktai” for.