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Super Mario Odyssey is a 2017 platform game developed and published by Nintendo for the Nintendo Switch video game console. An entry in the Super Mario series, it follows Mario and his new ally Cappy—a sentient hat that allows Mario to control other characters and objects—as they journey across various kingdoms to save Princess Peach from his nemesis Bowser and his plans of forced marriage. In contrast to the linear gameplay of prior entries, the game returns to the primarily open-ended, 3D platform gameplay featured in Super Mario 64 and Super Mario Sunshine.

In Odyssey, Mario explores various kingdoms and collects Power Moons hidden inside them, which is used as a source of fuel to power "The Odyssey", an airship, to travel to new locations. Cappy's main function is the "capture" ability, which allows Mario to assume possession of enemies and other objects, which is used to solve puzzles and progress in the game. After completing the main story mode, other post-game kingdoms are unlockable and an additional minigame, "Luigi's Balloon World", is playable. The game supports multiplayer and virtual reality via a Nintendo Labo kit.

The game was developed by Nintendo's Entertainment Planning & Development division, and began development soon after the release of Super Mario 3D World in 2013. Various ideas were suggested during development, and to incorporate them all, the team decided to employ a sandbox-style of gameplay. Unlike previous installments such as New Super Mario Bros. and Super Mario 3D World, which were aimed at a casual audience, the team designed Super Mario Odyssey to appeal to the series' core fans. The game also features a vocal theme song, "Jump Up, Super Star!", a first for the series. Odyssey was teased in 2016, announced in January 2017, and released in October of the same year.

Super Mario Odyssey received acclaim from critics who called it one of the best games in the series, with particular praise towards its inventiveness and originality. It also won numerous awards, including for game of the year. The game sold over 20 million copies by March 2021, making it one of the best-selling Switch games and the fastest-selling Mario game. The game won numerous awards in various categories, and was also nominated multiple times over for Game of the Year.