The most annoying level

[Ultimecia]

There is this one level in Megaman Zero (the Phantom one) where besides the traps you got to backtrack the entire level searching for the bombs. Oh, and there is the blasted countdown. I'm a bit better player than before, I'm going to play it again on Megaman Zero Collection (ok the game was nerfed, but still) so let's see how I can handle it.

There was one specially annoying extra boss at Shadow Hearts (PS1), called Seraphic Radiance. He's much easier on the sequel, but still hard (but not that hard)