Bonkheads is a 2D platform action game similar to Mario Bros. where you control either of two trolls: Grag or Thog. Your troll town is disturbed by evil animals, a giant shrew and the devil itself and you have to defend your home. The trolls need to bonk their heads on the platforms underneath each enemy to knock them out, then throw them off the screen. The game contains over 100 levels, twelve different environments, various bosses, special blocks that provide help or hinder, different types of power-up gems and both cooperative and competitive games for two players.