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(Metroid Prime 1, 2 and 3) Unlockable: Credits
You can unlock credits in all three games for purchasing bonuses. Each color of credit is awarded for specific actions in specific games. Here's how to win each type of credit:
* Blue Credits - Use the scan visor to scan objects/items for your log in Metroid Prime 3
* Friend/Green Credits - Use WiiConnect24 to gather these from friends playing Metroid Prime Trilogy
* Orange/Purple/Yellow Credits - Defeat bosses in Metroid Prime 1, 2 and 3
* Red Credits - Use the scan visor to scan creatures for your log in Metroid Prime 3
* Silver Credits - Collect Chozo Artifacts / Keys and complete Log and Inventory