ソニックチーム
In 1999, shortly after the release of "Sonic Adventure", twelve Sonic Team members relocated to San Francisco to establish Sonic Team USA, while others remained in Japan. Shortly afterward, a number of key employees—including Ohshima—left Sega to form a new studio, Artoon. Sonic Team achieved success in the arcade game market in 1999 with the launch of rhythm game "Samba de Amigo", released the following year for the Dreamcast. The studio also began developing online games; in 1999, they released "ChuChu Rocket!", a puzzle game that made use of the Dreamcast's online capabilities. In 2000, Sonic Team launched the role-playing game "Phantasy Star Online" to critical and commercial success.