Princes of Light is a very fun co-op game. The objective is to find the orbs and if they collide so that the door is open to proceed, many challenges await you inside the castle. Single player: Use arrow keys to move / C – Jump / X – Attack / Z - Exchange Co-op – Player 1: Use AD to move / B – Attack / V – Jump Co-op – Player 2: Use arrow keys to move / nub 3 – Attack / nub 2 – Jump