The object of the game is to position the falling shapes, Tetraminoes, across the bottom of a rectangular pit. Tetraminoes are shapes created from four blocks joined together into seven different patterns. The Tetraminoes must be rotated as they fall, and positioned across the bottom leaving no open spaces. When an entire horizontal line fills with blocks, the line clears from the screen. If lines are not completely filled with blocks, they will not clear from the screen, and the Tetraminoes will continue to stack up higher and higher. If the stack of Tetraminoes reaches the top, the game is over! Tetris Worlds places the player in a universe where Tetris is played in different ways on different planets. The inhabitants of these worlds (Minos) interact with the player and with each other. Test your Tetris skills in the most popular versions of Tetris, or the latest cutting-edge variations, such as Gadget Tetris and Bombtris. If you aren't addicted to Tetris, you must be living under a rock!