Super Mario Advance 4: Super Mario Bros. 3 [GBA]
Unlock World Selection Screen
Beat the game clearing every single level (90 in total). Once Bowser is defeated, save and you will be brought to a World Selection screen where you can jump to any of the 8 worlds. All locked doors will have been unlocked and you can freely visit any stage/bonus stage/castle/etc.
-from stateman
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