Camelot Software Planning

Camelot Co., Ltd. (also known as Camelot Software Planning) is a Japanese video game developer established in 1990 under the name Sega CD4, but quickly renamed to Sonic! Software Planning. Named after Sonic the Hedgehog, they were closely involved with Sega and responsible for initial development of the Shining series. In 1995, there was a brief period where they worked for Sony Computer Entertainment in addition to creating Shining products.

By 2001, now known as Camelot, they had partnered with Nintendo to create the Mario Tennis and Mario Golf series of sports games, as well as the role-playing video game series Golden Sun.

Source: Wikipedia