Xatrix Entertainment Inc.

Xatrix Entertainment Inc. was the original name of Grey Matter Interactive Studios Inc., which was acquired by Activision in 2002.

Since 2005 the Grey Matter team is a part of Activision's subsidiary Treyarch and no longer exists as a separate entity.

Contribution to the Quake series

 * Quake II Mission Pack: The Reckoning (1998)

Other Notable Games
As Xatrix:
 * Redneck Rampage (1997)
 * Kingpin: Life of Crime (1999)

As Grey Matter Interactive Studios:
 * Return to Castle Wolfenstein Single Player (2001, based on the Quake 3 Arena engine)
 * Call of Duty: United Offensive expansion pack (2004, based on the Quake 3 Arena engine)