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Wario World is a 2003 platform game developed by Treasure and published by Nintendo for the GameCube. The player controls Wario as he attempts to regain his treasure and castle from the evil sentient gem, Black Jewel. The gameplay sees Wario progressing through a series of 3D linear levels in a bid to find collectibles and defeat enemies in order to progress.

The game received mixed reception from critics, who praised the game's gameplay while criticizing its short length. It was a commercial success, selling over 142,000 copies in Japan and over 256,000 copies in the United States. In 2004, it was re-released as a Player's Choice title, and on the Nintendo Switch 2 via the Nintendo Classics service in December 2025.

Wario World is a 3D platformer with an emphasis on exaggerated combat. The player, controlling Wario, attempts to reclaim his treasure trove and newly built castle from an evil sentient gem named Black Jewel. To accomplish this, Wario traverses linear levels containing enemies and obstacles alongside collectibles, such as Spritelings, and coins which can be collected to help further progression. Each level also holds trapdoors which, when found, lead to either a platforming or puzzle-oriented challenge. These challenges help in obtaining more treasures, a type of collectible that when all obtained unlock minigames from the Game Boy Advance title WarioWare, Inc.: Mega Microgames! which can be played by using the GameCube – Game Boy Advance link cable.

Wario can attack enemies in a variety of ways. Alongside basic punches, Wario can grab enemies and either spin them around, throw them, or piledrive them into the ground. Wario can obtain more hearts by collecting pieces of golden statues resembling himself.