Sammy Corporation
Following the release of "Sonic Adventure" in 1998, some Sonic Team staff moved to the United States to form Sonic Team USA and develop "Sonic Adventure 2" (2001). With Sega's divestiture of its studios into separate companies, R&amp;D No. 8 became SONICTEAM Ltd. in 2000, with Naka as CEO and Sonic Team USA as its subsidiary. Sega's financial troubles led to several major structural changes in the early 2000s; the United Game Artists studio was absorbed by Sonic Team in 2003, and Sonic Team USA became Sega Studios USA in 2004. After Sammy Corporation purchased Sega in 2004, Sonic Team was reincorporated to become Sega's GE1 research and development department, later renamed CS2.