The old Tetris game details. Tetris 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.Tetris game kept records by how fast a certain number of lines could be cleared depending on the level. A level-up would occur once every ten lines are cleared and the blocks fall slightly faster and typically more points are given.
