Counter Strike: Source – Modern Warfare 3 – modification of the original project. The third part is presented as the developers' last attempt to do what they originally intended. The weapon system was redesigned, the appearance of some guns, their damage, animations and sounds were changed. Maps were added where you need to plant a bomb or save hostages, as well as a competitive mode for multiplayer sessions.

This version of Counter Strike: Source features new textures and higher resolution. When dying or performing various actions, bots say lines or express their emotions about what happened. The user will notice the added models of new characters and weapons. The concept of the standard mode remains the same. The special forces team must protect the bomb planting points, kill all opponents or defuse the already planted C4. Terrorists need to plant the explosive and let it explode.

More attention is paid to the graphic component of CS. The added maps represent the complexity and unusualness of the work of the anti-terrorist unit. The user can choose a special unit, for example, GIGN. The class differs only in appearance and voice lines of characters. The engine makes dead bodies fall randomly, and when hit, blood remains on the walls and other elements of the environment.