If you haven’t heard of it, the Tetris effect occurs when one devotes an excessive amount of time to an activity or game, and it begins to overtake the sufferer’s thoughts and dreams. It’s named for the classic block-stacking puzzler Tetris. At its release, Tetris took the world by storm and people began to devote massive amounts of time to it. Players began to see the title's abstract shapes in everyday life, trying to visualize how pieces of furniture and other objects would fit together to form perfect rows, for example. Even dreams of falling blocks became common.