Hidden Base is the 10th level in the Hero Story of Sonic Adventure 2 and Miles "Tails" Prower's fourth stage. It is Tails' version of Dr. Eggman's Sand Ocean stage.


After leaving Central City and joining up with Knuckles, Knuckles leads Sonic, Tails, and Amy to Dr. Eggman's pyramid base, where he said he saw Rouge enter the pyramid and assumed Eggman was there too. At this, Tails volunteers to find the entrance to the base.


The upgrade for this stage is Mystic Melody, but to get to its location, Tails needs the upgrade Bazooka.

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