Shadow Boxing achievement in Sonic Generations

How to unlock the Shadow Boxing achievement in Sonic Generations: Defeat Shadow. This achievement is worth 25 Gamerscore.

Suddenly, Sonic CD on Steam (and Sonic 4: Ep. 1 should you want it) : r/Games

Sonic Generations (Video Game) - TV Tropes

Best Sonic Generations Posts - Reddit

Sonic Generations Trophy Guide & Road Map

Sonic Generations - Remastered by UNSC-spartan112 on DeviantArt

Sonic Generations Achievement Guide & Road Map

Sonic Generations Achievement Guide & Road Map

Sega Sonic Division Wishes To See Sonic Surpassing Mario : r/gaming

Shadow Boxing achievement in Sonic Generations