During my last trip, I maxed out my score fairly easily, and I only really concentrated on three targets
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In the first room, there is a claw with a target on the underside of it at the end of the room on the right side, head for that, it USUALLY, not always, will give 100,000 points per hit, so try to hit that several times before it becomes impossible to get to. In the second room, I've always gone after the target towards the top of the volcano, which is usually 25,000 per hit. Finally, there is a target in the room with the"double side", one side is the battery shooting range, but disregard that, turn toward the opposite side, and concetrate on the target at the very bottom of Zurg's ship, that also should give you 100,000 points per hit, and hopefully, an easily maxed out scoreboard!
- Hope these help!