Secret Mission

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

Secret Missions are special levels on the PS2 and Wii versions of Sonic Unleashed. There is a total of 28 Secret Missions in this game, from which 23 of them can be unlocked by collecting Secret Mission Item Boxes placed behind some Item Doors in the Gaia Gates.

The other five missions are unlocked as soon as you get set amounts of Secret Items. This is the case for the last obtainable mission (Secret Mission 25) - "Reach the goal unscathed!" Day Stage in Adabat - that requires you to get all Secret Items (except Secret Movie 36, which you obtain in this level). Secret Missions 2, 6, 10 and 13 are the other missions that require a certain number of items to be obtained, although research on how many exactly has yet to be done.

List of Secret Missions

	Secret Mission 1 Apotos — Day Stage
	Secret Mission 2 Apotos — Day Stage
	Secret Mission 3 Holoska — Day Stage
	Secret Mission 4 Holoska — Day Stage
	Secret Mission 5 Spagonia — Night Stage
	Secret Mission 6 Spagonia — Night Stage
	Secret Mission 7 Chun-nan — Night Stage
	Secret Mission 8 Chun-nan — Night Stage
	Secret Mission 9 Spagonia — Day Stage
	Secret Mission 10 Spagonia — Day Stage
	Secret Mission 11 Chun-nan — Day Stage
	Secret Mission 12 Chun-nan — Day Stage
	Secret Mission 13 Chun-nan — Day Stage
	Secret Mission 14 Holoska — Night Stage
	Secret Mission 15 Holoska — Night Stage
	Secret Mission 16 Shamar — Day Stage
	Secret Mission 17 Shamar — Day Stage
	Secret Mission 18 Shamar — Night Stage
	Secret Mission 19 Shamar — Night Stage
	Secret Mission 20 Adabat — Night Stage
	Secret Mission 21 Adabat — Night Stage
	Secret Mission 22 Adabat — Day Stage
	Secret Mission 23 Adabat — Day Stage
	Secret Mission 24 Adabat — Day Stage
	Secret Mission 25 Adabat — Day Stage
	Secret Mission 26 Eggmanland — Night Stage
	Secret Mission 27 Eggmanland — Night Stage
	Secret Mission 28 Eggmanland — Night Stage