Zool is a fast-paced side-scrolling platformer where Zool, a gremlin-like creature from another dimension, aims to become a Ninja by defeating enemies and traversing six worlds. Each world consists of three stages, which he must conquer to reach his goal.
The gameplay involves running, jumping, climbing walls, and shooting enemies. Power-ups, such as hearts, bombs, shields, enhanced jumping skills, and an extra Zool clone, are scattered throughout the levels. The clone duplicates the original's movements for a short time after they're performed.
Players can adjust various settings in the options menu, including the difficulty level, game speed (which can be played at two different speeds), number of continues, and background music style (either rock or funk).