Yep after having beaten it I can confirm there is a third diffculty level. Hope that's not too much of a spoiler.
My only real cons with this game
1) it's waaay to short. It took me like 9 hours to get through beggining to end.
2) The gameplay is solid but Suda seems to think you'll be bored with it... so later on he comes up with new gameplay modes that are fun and all but just different from the slicing and dicing of bad guys and completely change everything around. Which wouldn't be a problem except you play these modes only once.
It would be nice if there was a way to play these modes again independent of the campaign system.
3) I suck at button mashing. I couldn't raise my strength once in the game.
Still i'll play through it another time or two to collect all the outfits. There is something oddly satisfying about changing clothes... picking the dorkier T-shirts for when you do your lawnwork and minor league assassains and switching to more of the badass gear when your gunning for a ranked opponent.
