If you have a Nintendo DS, I highly recomend this game. I know that the last few Mega Man Zero games kinda sucked, but this on eis awsome. Instead of being transported to places for missions, you have to find the are your self, making it kinda like Castlevainia.
Im not gunna tell you too much about it tho, cuz i want you to play it, it is awsome!
it depends on wich mode u used, i beat it in 5 hours on easy, but i am having troubles on normal... its realy getting to me. the megaman zero games have a more in depth story than other megaman games, i guess if your not a fan its different... i thought it was a worth while game, its only my 3rd ds game anyways, next is pokemon pearl