Oh yeah, because I completed Toy Kingdom Act 3 with Tails and Knuckles, I think? Aside from that, I've got Chao hunting to do, then I have get these accursed keys just to play a Special Stage and if I mess up, I have to go back to any of the 3 acts to get the key again.
Yeah, can get annoying ,but I just cheat :p
The Special Stage music is kinda fun though--