The object of the original Tetris was to arrange falling bricks into straight lines by twisting and turning them into place. In the puzzle mode, you guide a small explorer through a series of caves by solving Tetris puzzles. A Tetris puzzle is an arrangement of pre-placed bricks that must be cleared. You have a limited time to complete each level since a wall of spikes is descending from the ceiling. The deeper the adventurer goes, the more difficult the puzzles get and the quicker the falling spikes come down.