Biomechanical Toy is a colourful eightway-scrolling platform game set in a world of magically animated toys. The magical pendulum that animates the toys has been stolen by the evil 'Scrubby' - a criminal once imprisoned for trying to steal the pendulum who has managed to escape and take his revenge.

Evil toys now patrol the kingdom and must be destroyed or avoided. Good toys have been trapped throughout the levels and if freed by Inguz, will give help by providing additional firepower for a short time.

Inguz carries a basic, single-firing gun, although additional ammo clips can be found throughout the game that upgrade the gun with either extra shot power, automatic firing or exploding bullets. When the gun's current ammo clip is empty, Inguz will take a moment to reload, leaving him vulnerable to attack.

Inguz begins each stage (and each new life) with a full health meter of eighty units, but food can be found that will boost the health meter. The player can lose a life either by running out of health, falling off the bottom of the screen, or running out of time. Clearing each stage awards bonus points based on both remaining time and health units.

Checkpoints