I saw that someone mentioned they were also stuck at 98% completion in an earlier post and I didn't really see any response to it. I completed every hidden level and have gotten every peice of the outfit and I really don't know what else to do to get 100%. Any information would be greatly appreciated.
I think you have to beat it on "gentleman mode" (and clear all the hidden stages, etc.) to get 100% completion.
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Well i'm not sure if this makes you feel any better, but 5-1 really probably is the hardest level in the game.
It will make me feel a little better if I ever actually beat it. Fucking knockback!
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This game fucking hates.