Try to make full lines of blocks to make the line(s) dissapear from the screen. You have to keep making lines otherwise the blocks hit the top of the level and you will lose the game. A helpfull hint: you can rotate blocks with the spacebar. Tetris belongs to the classic free arcade games.
YOU ARE PLAYING TETRIS AT FUNNY GAMES (WS)
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game instructions and controles
Use the arrow keys to rotate your blocks around
Press the spacebar to quickly drop the current block on the bottom.