This iPod prototype was hiding Apple’s unreleased Tetris clone

Stacker for iPod is a Tetris clone that never made it to retail models. | Image: Apple Demo YouTuber Apple Demo has found a prototype third-generation iPod that contains a game called Stacker, which never made it to retail models. In addition to Apple’s own version of Tetris, the engineering sample iPod also came loaded with other unreleased titles, including games called Block0 and Klondike, as noted by Engadget.On the back of the prototype iPod, a “DVT” (Design Validation Tes