In Super Mario 3D Land for the Nintendo 3DS, unlocking the final hidden level in the game S8-Crown can be quite a feat.
To unlock S8-Crown, you need to collect all 290 Star Medals, beat every level as both Mario and Luigi, and get golden flagpoles on every level.
Note that when it says “collect all 290 star medals”, that does not include mystery boxes. This means, you must collect all 290 star medals hidden in the levels of the game.
Check out my other guide if you need to know how to unlock Luigi.