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Intelligent Systems Co., Ltd. (株式会社インテリジェントシステムズ, Kabushiki-Gaisha Interijento Shisutemuzu) is a video game developer and internal team of Nintendo.

Intelligent Systems came into being when members of Nintendo's Nintendo Research & Development 1 division headed by Gunpei Yokoi splintered off into its own development team. Yokoi worked alongside Intelligent Systems on a number of its titles before his departure from Nintendo following the failure of the Virtual Boy.

Intelligent Systems is known for creating or expanding some of the most well-received Nintendo franchises, including Metroid, Nintendo Wars, Puzzle League, Paper Mario, WarioWare, and Fire Emblem. In the past it has also designed many of Nintendo's development tools including the Super Nintendo Emulator SE.

Intelligent Systems currently focuses on Nintendo Switch development and has developed games for all of Nintendo's previous handhelds and consoles.