get every star level you find
yes
No.
Complete World Star-2
go to the maiger star and shoot it with stars
finish world 8 with all star coins
you have to get all the star coins in world one
yes and it is a city but to get it you have to get all the star coins in world 9 sorry if I am mixed up with[super mario galaxy]
yes
yes
You get every green star.
Look under the mushroom floors. There will be a lot to find.
The 4 glitches in Super paper Mario world 2-1 are the Skeleton pokey, Star Block, Dark Town and the barriers.