Attack of the Phantom Karate Devils is a single-player action, casual, arcade, and fighting game in which players control a hero to combat shadow-like enemies using various kicks and punches, earning points for successful hits. In this game, the storyline revolves around avenging the murder of the player's master by defeating an army of shadowy creatures across multiple levels, with progression unlocked through reaching specific scores. It stands out with its side-view gameplay, the use of a joystick for precise control, and the inclusion of thrown knives and stars that players must avoid or block. The game features a unique mechanic where strength points are depleted upon being hit or attacking, but can be replenished by passing through doors that appear after reaching certain scores, adding a strategic layer to combat and movement.