Thanks to how cluttered the modern internet is, it's difficult to find a clear, complete answer on this subject. If you collect every ring in a stage, you get an A rank, regardless of how poorly you do, even if you get hit and lose them. I always thought this was interesting, and wanted to do this as a challenge run: A-rank all the stages by nabbing all the rings. But in some stages, this is literally impossible because some rings spawn in a death barrier, or are otherwise uncollectible. What stages, exactly, suffer from this problem? Are there any mods for the Steam version that fix this? Or would I have to use a cheat engine to try to keep within the spirit of this challenge?