|Publisher(s)||New Super Mario Bros. X|
|Genre(s)||12 levels (except rainbow levels)|
World 3 is the third normal world in New Super Mario Bros. X. It is a snow-based world, and the levels are made up of snow or ice. The map music is the same one which was used in World 3 of New Super Mario Bros. Wii. This level is unlocked when a player completes World 2-Castle.
There are 12 levels and five Toad Houses in this world, Of the 12 levels, eight levels are on the main path, which includes five normal levels, a Ghost House, and the Fortress and Castle. Of the remaining four levels, one is the Rainbow level, one is a level requiring payment of Star Coins and the other two are secret levels. Of the five Toad Houses, two are red, two are green and one is yellow. The boss of this world is Morton Koopa Jr., who is fought at the castle level.