Mario Club

Mario Club (also known as Super Mario Club, Kyoto research center, Mario Club staff, NCL Super Mario Club, and Super Mario Club Debug Team) is a subsidiary of Nintendo, responsible for the debugging of many of their games. They are usually credited under Debug, Testing or Special Thanks in Nintendo game credits. In July 2009, Mario Club became a fully owned subsidiary of Nintendo after years of being a debugging team within the broader company. They are named for Nintendo's mascot, Mario.

With regard to the Metroid series, Mario Club has debugged Metroid Fusion, Metroid: Zero Mission, Metroid: Other M, Metroid Prime, Metroid Prime Hunters and Metroid Prime: Federation Force.