Re: 100% Completion
No and no.
Super Mario 3D Land maxes Star Coins out at 999 (which, by my rules, means you don't have to get them all, because you don't have to max out scores/collectibles). The only Star Coins that need to be collected are the ones in found in levels. Also the the Dragon Coins in Mario World don't have to be collected, because doing so does not unlock anything and isn't even acknowledged by the game. It's really just another way of getting 1-Ups, and not something you have to do.
Hope this helped. Please make an account too, it's fun here :p
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