read this dont get up it is very hard at first but after a while probably 20 to 30 minutes it gets MUCh easyer.
For the question of saving is you cant save in between sets. Each set is ten levels one of them being a bonus level.
For each world there in 10 levels for easy and 10 different levels for hard.
beat all 20 to get to the next world.
So just to clarify... it DOES save your progress after you beat each set of levels? Or is it basically a brand new game every time you open it?