Super Mario Bros. X Forums

Is there a way to allow the game to resize level entrances, particularly those within the custom range? If tiles can be automatically resized, then wouldn't it make sense to apply that same property to levels as well? If anyone has figured this out, please let me know.

The world map is rather primitive and larger level tiles with larger entrances just amount to more walkable space, similar to if you offset a level by 16 pixels on the grid. This may not be what you are looking for.
Also there is no custom range for the world map yet.

if you use xmap, you'll be able to create txt files for overworld levels and change their displayed size. this will make them act like bigger vanilla level entrances (e.g. smb3 bowser's castle) where the bottom center is a 32x32 enterable level object. if you do actually want to expand the size of the level entrance itself, i believe it's memory offsets 0x10 and 0x18 for the width and height respectfully (both type FIELD_DFLOAT).