I know X was referring to the DS Zero compilation (which took me a good number of tries to work out a button config that made sense), I wonder if Warmachine also meant that.
Either way, Mega Man ZX is a heck of a game. Never finished it though, largely due to getting lost later on. It's a wonderful Metroidvania style game, just wish Inti Creates had the sense to utilize the map system associated with that genre, because ZX's map makes no sense to me.