Tetris Online. Sliding Bricks. Original version of the Tetris game. From the bottom of the board, square pieces of different colors will appear that will move up the screen. Use the ARROW KEYS to move your piece horizontally. To eliminate the rows you must match your piece with another of the same color from the bottom row. As the game progresses the pace quickens. The game of Tetris ends when the pieces are stacked on top of each other to prevent the generation of new ones. Accumulate points by keeping the Tetris game active.