There is a problem: so, i have flicked all the switches in order: concrete world, yellow world, magic tower and labirynth. I got all 3 stars from every world... But for some reason the fourth white star on the tv noise in the bottom right of the world selection won't appear, despite the fact that the three that did appear are shifted slightly to the right, as if in order to leave space for a missing first one. (Plus the green light in the secret room doesn't turn on)
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Sadly, the only thing that seems to work is if you restart the game and push these switches on your first visit. It's kinda annoying, but it ain't too bad.
Personally, I just wished we kept our companions when we reach the main ending. They gave some life to the world, they were like, our roomies, y'know?