Isn't Tetris fun? Now you can play it while you sip your coffee… kind of. Actually, when you add a hot liquid to this fun Tetris Heat-Change 11 oz. Mug, brightly colored tetriminos that were invisible before appear in the field of play and the Score, Level, and Lines numbers increase. It's amazing! If you're a ,i>Tetris junkie, you don't want to miss this! Hand wash only. Not dishwasher safe. Do not microwave.