On September 9th, 1999, Sega released their final video game console, the Dreamcast, in North America. As a sixth-generation video game system, it primarily competed with the Playstation 2, GameCube, and Xbox. The Dreamcast was the first video game console to include a built-in modem for internet access and online play. Though its Japanese release faced supply problems, the Dreamcast's release in the United States was backed by a large marketing campaign. Sega sold approximately 9.13 million Dreamcast units worldwide, and produced over 600 games for the console. Its best-selling game was "Sonic Adventure", released in 1998, which was also the first 3D game in the "Sonic the Hedgehog" franchise. However, sales for the console declined rapidly as Sony unveiled marketing for the Playstation 2. As a result, sales for the Dreamcast did not meet Sega's expectations, and after multiple attempts to revive the console, Sega discontinued the Dreamcast worldwide on March 31st, 2001, and exited the console market altogether.