A master class in hostile level design. This is a game that smugly shoves you over and says, "Alright, hot shot, you think you're good at Super Mario? You think you're so smart? Get a load of this."

Like, it's playable, and if you're a hardcore platformer fan you might even have fun with it, but... I dunno. I guess it's worth playing once to really grasp why the SMB2 swap happened for yourself instead of just hearing about it.