The King of Fighters ALLSTAR is a 3D action fighting game optimized for touchscreens. Players assemble teams of three fighters from a vast roster spanning the KOF series. Combat is simplified to a virtual joystick for movement and large, responsive buttons for attacks, special moves, and dodges, emphasizing timing and combo execution.

Gameplay revolves around real-time battles against AI opponents in various modes, including story chapters, time-attack challenges, and cooperative boss raids. Character progression is a core element, involving leveling up fighters, equipping special cards for stat boosts and skills, and upgrading their abilities. The game frequently updates with new characters and limited-time events.