1st room: target on the hand of the robot that is over the ride cars 2nd room: target at the top of the volcano that makes the volcano explode 3rd room: big one!!!! at the very bottom of Emperor Zurg's vehicle (hard to reach-You can only aim at it when you are entering or leaving the room) When you shoot at this, the bars above it light up, and then you can earn more points. In the room with the projections, if you aim at the wall to the right of the exit to this room, Zurg's ship will stop here, and there is a sensor there.
My husband has maxed out many times by using these tips!!!