K.O.S or Kill on Sight: Secret Operations is a free FPS (first person shooter). What makes this game special is that it runs on the Source engine. This engine was used to power games like Counter Strike and features things like advanced shading and physics. Due to this, you can expect this game to function similar to other games using the Source engine.
September 7, 2010 has been announced as the launch date to 'Reload for Chaos', the expansion to the first person shooter, K.O.S.- Secret Operations.
K.O.S.-Secret Operations, launched commercially with the debut of their item mall called the Gun Shop.
"...this is the very first free-to-play FPS that uses the Source game engine from Counterstrike, so players of that game will be able to pick up K.O.S. with a short learning curve."
K.O.S., a Free to Play FPS Will hit Open Beta on January 12th!