Everybody knows how to play tetris. The 'puzzle' element didn't make any sense though.
That's because the game is NOT tetris. Perhaps you should actually play the game long enough to find out why...Forget Tetris. It's not the same rules.
For any future players: Please play at least 3 or 4 levels worth (even if it doesn't interest you right away to see if that feeling changes as the game progresses).