How Many Secret Levels Are There?

There are a couple of secret levels in the game that were impossible to find before. The original side scrowling levels have been recreated with help from two interns who did them entirely by themselves. There is one collectable at the end of world one, once you beat the big b boss,. there's a single collectable above the exit, but you have to climb up andget it. And i was wondering what the story is with tha. If you actually looking and be superior, this cpl has its own entryoh, it does. That was quite a fully inclusion. We asked george allen, who er as the programme on the original, and he didn't know