A platformer where you collect masks that transform the protagonist Casey into different characters, each with unique abilities and health pools. The game contains 103 levels connected by flags and teleporters that can warp you to alternate routes through the campaign. You'll jump on enemies, dodge obstacles, and use Diamond Powers—special moves that consume collectible diamonds. No password system existed in the original release, so completing all levels meant doing it in one sitting. Levels vary in structure, often requiring specific mask forms to beat them efficiently. You lose a life if Casey loses all health in human form, gets crushed, falls into pits, or runs out of time. Bonuses reward speed, no-hit runs, and prize-free clears. The mask variety keeps things unpredictable across the campaign's considerable length.
