Hidden Island

Sonic Rush Adventure

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Hidden Island

Hidden Island
Extra Zone, Sonic Rush Adventure
Number of Acts: 16 seperate islands
Level themes: tropical island, ocean
Played as: Sonic, Blaze

Hidden Islands are stages in Sonic Rush Adventure, scattered throughout the world map of the Sol Dimension.

Overview

These are short levels, some of them required to further progress in the game's story itself. Upon finishing any particular Hidden Island, the player may unlock missions (which can be played through Marine back at the house on Southern Island). Some of these missions reward the player with Sol Emeralds which allow the Last Story to be unlocked also.

The Hidden Islands work in the same way as the main islands in the way that every time the level is completed through stage select, or venturing to the island itself, the player is rewarded some Materials and Rings, which are both used to create and upgrade the watercraft used to travel the sea.

Hidden Island themes

Every Hidden Island has a "theme", which includes the background music, scenery, Badniks, and gimmicks. Many Hidden Islands take their theme from one of the first five stages in the game. Others use the exclusive "Hidden Island" theme, which appears as grassy cliffs with islands in the background. The music playing during this theme is a remix of A New Venture.

The following list also includes what types of Material can be earned for completing them, and whether they are optional or not.

Island	Theme	Materials	Optional?
Hidden Island 1	Hidden Island	Blue and Iron Material	No
Hidden Island 2	Hidden Island	Blue and Iron Material	No
Hidden Island 3	Hidden Island	Blue and Iron Material	No
Hidden Island 4	Coral Cave	Red Material	No
Hidden Island 5	Hidden Island	Blue and Iron Material	No
Hidden Island 6	Plant Kingdom	Blue and Green Material	Yes
Hidden Island 7	Plant Kingdom	Iron and Green Material	Yes
Hidden Island 8	Coral Cave	Blue and Red Material	Yes
Hidden Island 9	Machine Labyrinth	Iron and Bronze Material	Yes
Hidden Island 10	Machine Labyrinth	Blue and Bronze Material	Yes
Hidden Island 11	Coral Cave	Iron and Red Material	Yes
Hidden Island 12	Blizzard Peaks	Blue and Aqua Material	Yes
Hidden Island 13	Blizzard Peaks	Iron and Aqua Material	Yes
Hidden Island 14	Hidden Island	Blue and Iron Material	Yes
Hidden Island 15	Haunted Ship	Blue and Silver Material	Yes
Hidden Island 16	Hidden Island*	Blue and Iron Material	Yes

* Hidden Island 16 is actually near identical (design-wise) to Leaf Storm Act 1 from Sonic Rush.

Enemies

While Hidden Islands themed after other stages feature their respective enemies, the following enemies only appear on Hidden Islands which use the generic "Hidden Island" theme:

	Kaizoku Bomb — Tiny robots that attack by throwing powder kegs.
	Kaizoku Hogan — Tough mace-swinging robots that take three hits to destroy.
	Sky Moon — Floating robots normally seen in Sky Babylon. Only the yellow ones appear on these islands.