http://www.thetetrisgame.com
http://www.thetetrisgame.com
TheTetris game instructions mention the seven one-sided tetraminoes in tetris as I, J, L, O, S, T and Z -due to their resembling letters of the alphabet-but players sometimes use other names for the pieces. All are capable of single and double clear.
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Tetris Game - The classic tetris game free