: Enemies can float on water and move freely, but they cannot move through blocks or barriers. They speed up and become more unpredictable the longer you take to complete a level.

: You must kill eight "spinning heads" in every level to progress.

: Jump directly onto the heads to crush them from above.

: Jack can be killed if a block falls on him or if an enemy jumps on him.

: Jack can jump upwards to a maximum height of three blocks . He can fall from any height safely, provided he doesn't land in water.