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Apple built a Tetris clone for the iPod but never released it
Apple once designed a Tetris clone that has been found on a prototype version of the third-generation iPod, indicating the company was experimenting with releasing the game on the music player. It’s called Stacker and, obviously, is controlled via the iPod’s scroll wheel. The software was spotted by X user AppleDemoYT, who is known for finding rare prototype devices.