Sammy Corporation
In 2004, Japanese company Sammy acquired a controlling interest in Sega and formed Sega Sammy Corporation. Prior to the merger, Sega began the process of re-integrating its subsidiaries into the main company. Sonic Team USA became Sega Studios USA, while SONICTEAM Ltd. became Sega's Global Entertainment 1 research and development division (GE1). The team is still referred to as Sonic Team. As of 2005, senior Sega figures including Toshihiro Nagoshi and Yu Suzuki were reporting to Naka; according to Takashi Yuda, he was involved in all Sega game development. Naka announced his departure on 8 May 2006 and formed a new studio, Prope, to focus on creating original games. He left Sonic Team during the development of "Sonic the Hedgehog" (2006), released as part of the 15-year anniversary of the "Sonic" franchise. "Sonic the Hedgehog" was panned for its bugs and design flaws; "Sonic Unleashed" (2008) received mixed reviews, but sold well. Both games were released for the PlayStation 3 and Xbox 360; Sonic Team also developed a series of "Sonic" games for the Wii and Nintendo DS, such as 2007's "Sonic and the Secret Rings".