Casus Belli is a realistic multiplayer mod for Crysis Wars. It takes place in a not so distant future in the context of a third world war. You embody a soldier in many different surroundings, from the Afghan deserts to Ukrainian cities. The gameplay is battlefield-like, offering many brand new features. Casus Belli is developed by a non-profit association.
The game is not standalone but no purchase is necessary to play it. You can download and install Crysis Wars Trial version and patch 1.5, then download and install Casus Belli mod and patch 1.1. The Game is supported by Desura, Crysis wars Trial is available on Steam.