User blog comment:Nathbud789/Hardest Sonic Boss/@comment-1314796-20100414152317

Well, I just got my DS a short time ago, so I only have Sonic Advance, Sonic advance 2, and Sonic Battle. (With Sonic Classic Collection on it's way from China). Out of all of those, the hardest boss I've faced is the Egg-Go-Round from Sonic Advance 2.