proportional to the stage of the game you're in, this is the second hardest world IMO. If you ignore The End, this is the easiest world in the game proportionally. the levels are fun, but they aren't really challenging, if you have an Xbox and somehow have the "Teh internets" world unlocked on your file, than the world "Expert Remix" makes there levels as hard as they should be, while still making good use of pre-established mechanics like the escalators. Also, if you go and play the expert remix world, be prepared for one of the worst experiences of your life in the level 'ping'