Fallout RadioActive Mac OS X

Fallout:
A devastating nuclear war had wiped out almost the entire population of the Earth. The civilization, as we know it, has been destroyed. The Earth has become a huge wasteland populated by mutated creatures. Only small number of humans survived and they formed communities living on the surface, where they mostly scavenge what remains from the pre-war civilization. Some lucky people managed to reach safety of the Vaults, huge underground dwellings, during the war. Recently, the water purification controller chip in Vault 13 broke. Without clean water, the people of the Vault cannot survive. One person is sent to find a replacement chip and ventures outside to face a dangerous world, hoping to return within a hundred and fifty days.