Secret Mission

Secret Mission key from the PS2/Wii version of Sonic Unleashed.

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Secret Missions are special levels that can be unlocked when matching certain conditions on the PS2 and Wii versions of Sonic Unleashed. There is a total of 28 Secret Missions in this game: 23 of them are placed inside Item Boxes scattered all arround the world behind some Item Doors of the Gaia Gates, while the other 5 can be obtained when you collect a certain amount of Secret Items:

• The last obtainable mission (Secret Mission 25) - "Reach the goal unscathed!" Day Stage in Adabat - requires you to get all Secret Items (except Secret Movie 36, which you obtain in this level).
• Secret Missions 2, 6, 10 and 13 also require a certain number of items to be obtained, although research on how many exactly has yet to be done.