Your mission in this two coop players sidescrolling shooter is to complete all 9 levels destroying waves of enemies and 5 bosses. Collect powerups by moving over them. Powerups will increase your speed, score and shield\'s power, upgrade your main weapons or add secondary weapons like missiles and lateral shots. At the end of odd-numbered levels you have to beat a boss to complete the level. The boss\'s remaining energy is displayed by a bar on the bottom of the screen.