Moon Hints & Cheats
Unlock Bonus MissionsIn each of the regular missions, you'll find three alien artifacts hidden throughout the level. Collect all three and complete the regular mission, and you'll unlock a bonus challenge.
How to Unlock Unlockable Collect all three alien artifacts in a regular mission, then complete the mission. Bonus Mission Challenges
Walkthroughs & FAQs
Hints & FAQs provided courtesy of GameFAQs.