It's because it isn't anything like Tetris in any way whatsoever. That isn't the metaphor you're looking for. The blocks in Tetris disappear from time to time, among other incongruities between the two. Klotski is the name of the game you're looking for. Klotski. Being able to rotate Klotski blocks would really destroy the entire purpose of that game.Unlike in Tetris, you can't rotate your gear by 90°. I never understood why. Is it too tough to implement?