Tactical Ops: Assault on Terror is an online multiplayer computer game with similar gameplay to Counter-Strike. Though it started as as a mod for Unreal Tournament in December 1999, it soon became available as a retail version, which was released in April 2002 in the United States. The retail version is a standalone which does not require Unreal Tournament and contains additional maps not found in the free download.

The game was developed by Kamehan Studios, the last version being 3.5.0.
In 2004, fans of the game got permission from Atari to create a patch. This version (3.5.0) was released on March 16, 2005. According to CSports.net, Tactical Ops is one of the 20 most popular online games.

Minimum System Requirements:
OS: Windows 98/ME/2000/XP
Processor: Pentium @ 200 MMX
Memory: 64 MB
Hard Drive: 120 MB Free
Video Memory: 8 MB
Sound Card: DirectX Compatible
Keyboard & Mouse
CD/DVD Rom Drive