A condition caused when a person plays too much Tetris. It is considered a psychological habit.

There are two symptoms of Tetris Effect, which occur without conscientiously thinking of it:
1. A person can't help but notice how neatly objects in the real world could be stacked together, and imagines a sort of Tetris game in which the objects are stacked.
2. A person visualizes games of Tetris or Tetris scenarios when they daydream, project mental images, or close their eyes.

Note: Such an effect occurs with various repetitive or puzzling tasks, most commonly Chess, Polarium, and Guitar Hero.