Counter Strike is the game that Counter Strike Animations is based off of. It is a first-person shooter developed by Valve, creator of the Half Life series, Team Fortress series and the Portal series.
There are two teams, the terrorists and counter-terrorists team. In the classic mode, the terrorists try to win by either killing all the counter-terrorists or by planting the bomb and having it explode. The counter-terrorists win by killing all the terrorists or by diffusing the bomb planted by the terrorists.
- This mode was mainly used in the animations.