Call of Duty Online. Prepare yourself for a cinematic thrill-ride as only Call of Duty can deliver. Engage enemy forces in New York, Paris, Berlin and other attack sites across the globe. The world stands on the brink, and Makarov is intent on bringing civilization to its knees. In this darkest hour, are you willing to do what is necessary? Play Call of Duty a FPS shooting game online in your browser without download or registration just join a server and start playing. This game is one of the action games at Round Games.