Pariah

You take role of Jack Mason, fired doctor, but now he nearly died in a crash. Now he is on the worst and most dangerous prison sector on the Earth with his patient. They have only 16 hours to save the Earth, if not the Earth will be destroyed with nuclear bomb to stop contamination from spreading. Pariah is built on Unreal Engine with Havok physics, whose will give you stunning visual effects. You can use bunch of great weapons, whose are upgradable to fit your gaming capabilities and drive heavily equipped and armored vehicles. It contains intense storyline in single-player campaign and great multiplayer with legendary modes like Deathmatch, Team Deathmatch, Capture the Flag etc. Game also has map editor, in which you can do everything and start building your map from zero and then share it on multiplayer with your friends.