World
From the Super Mario Wiki
This article is about the in-game term. For information about the world the player is native to, see Earth.
A world is a group of levels in a Mario game. In Super Mario Bros. and Super Mario Bros.: The Lost Levels, each world always has exactly four levels. However, starting in Super Mario Bros. 3, most games have a varying number of levels. In the three-dimensional Mario games, worlds are no long used; now each level stands alone (but each level is sometimes referred to as a world), and the missions are either referred to as courses or episodes.
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