Rhythm Badge

The Rhythm Badge is an upgrade for Miles "Tails" Prower in Sonic Adventure and its remake, Sonic Adventure DX. With this upgrade, Tails can perform a chain of Tail Swipes by simply holding the action button. As long as the action button is held, Tails will keep doing Tail Swipes.

Location
This upgrade is found when Tikal transports Tails to the ancient past. After arriving, head to the left to find it. After getting it, the player can move on with the story.