Captain Cosmo is a 1-4 player side-scrolling arcade game. The game follows Captain Cosmo, hero of the universe, as he attempts to save the world from escaped Munchies from the zoo.
The gameplay involves walking along the ground or flying through the air, with each level containing 5 yellow Munchies that move rapidly about the level. If the player shoots them with their laser gun, they turn green and can be safely picked up and carried back to the zoo. Completing all 5 Munchies in a level allows the player to advance to the next challenge.