UPDATED ON: January 18, 2010
Because this is the only way to remove blocks, you should try to form solid rows whenever possible. The game ends when the pieces stack up to the top of the playing area. You can manipulate a piece only when it is falling. Falling pieces may be rotated, moved horizontally, or dropped to the bottom of the playing area.
Based on the original idea "TETRIS" by Alexey Pajitnov. Tetris is absolutely FREE!