Shadow Generations - Radical Highway Act 1 

Fearless: Year of Shadow
"I'll overcome every obstacle, with this power!"
The final stage of the game is Shadow's first ever playable stage, from Sonic Adventure 2. The Doom Wings also serve as a super form of sorts in this game, as they require 50 rings at least to use, drain your ring counter, make you somewhat invincible and let you fly through the stages.