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    Expects keyboard input. The rotation for line blocks is the transpose of a 4x4, and all other blocks are rotated by the column-swapped transpose of a 3x3. Being a complete newbie with Tetris, I wrote the game to the original Tetris' standards so no fancy ARS/SRS-ghostblock functionality. Directional keys for strafing, rotation, and soft drop. Spacebar for hard drop.