I really need help, so I'll tell you what happend. beat the 1st world, and I just can't continue all I can play is the Prologue. Am I doing somthing wrong?

Replay the last cinematic without quitting. It should open the 2nd world.

@snoki he has another problem.

I had the same problem 2 times. You think you made the first chapter but after going back to your pod etc the first chapter is locked and you have to start from beginning again with the prologue (the first intro level in the prologue chapter).

when you finish the chapter 1 continue immediately with chapter 2, don't join friends, don't let friends join, don't play any other levels, do not go to pod if you don't have to. Continue with the story and it won't happen again. Well, that was my solution

I will try both solutions thanks

And I encountered a bigger problem. I try to go through the last cutscene in the prologue but then comes an infinite loading screen so I have to reset the game causing the 2nd world to open.