apparently not.  worth it?

Yeah if you like to be mindblowed.

That being said, you need a guide for collecting all the stars. No, seriously, there's nothing wrong in using a guide here because, except for one, there's a 0,5% chance that you would have found them all by yourself.

my mind is already blown.   for how much i love this game i can't believe i even knew this was a possibility.  

#kitler53fail

Hence why I say that a guide is necessary here. :P

EDIT: If I remember correctly, grab six stars scattered around the stages, then go back and do World 1 (also known as 1.).

You can figure out the rest from here!

Now I want to see that alternate Braid ending!!

If you don't mind spoilers, here you go!

I was never gonna go for all of the stars so thanks.  Never knew it existed.  Was a little bit of a letdown, though. :(

Maybe because you're watching it now, but back when Braid was released and all kind of theories run wild through the internet, this twist was brilliant :P

I already had BttF, but you have gotten the best games, you are so smart! =D

Also, BttF is a blast, you are going to love it!