World 1

World 1 (also written as World One) can refer to:


 * 25m - World One of Donkey Kong.
 * World 1 (SMB) - World One of Super Mario Bros..
 * World 1 (The Lost Levels) - World One of Super Mario Bros.: The Lost Levels.
 * World 1 (SMB2) - World One of Super Mario Bros. 2 .
 * Grass Land - World One of Super Mario Bros. 3 .
 * Yoshi's Island - World One of Super Mario World.
 * Mushroom Kingdom - World One of Super Mario RPG: Legend of the Seven Stars.
 * World 1 (YI) - World One of Super Mario World 2: Yoshi's Island.
 * World 1 (YIDS) - World One of Yoshi's Island DS.
 * Birabuto Kingdom - World One of Super Mario Land.
 * Rice Beach - World One of Wario Land: Super Mario Land 3.
 * World 1 (NSMB) - World One of New Super Mario Bros.
 * Ladida Plains - World One of Super Princess Peach.
 * Mario Toy Company - World One of Mario vs. Donkey Kong.
 * Mushroom Mayhem - World One of Mario vs. Donkey Kong 2: March of the Minis.
 * The Terrace - World One of Super Mario Galaxy.