"Fallout" Game (late 1990s)

"Fallout" is a PC-based role playing game—rated "Mature" for animated blood and gore. The box claims that:  "This year's Fallout Nuclear Survival Kit uses the latest technology to keep you alive and kicking in the event of a nuclear disaster," but it follows this with a warning that the "Contents do not provide protection from radiation, real or implied." Hmmmm… no protection against implied fallout, eh?

The plot: A group of 1000 people, holed up in an underground shelter, have had no contact with the outside world for some 80 years after a nuclear holocaust. The community's water recycler has failed and you have to go outside to find a replacement microchip for the recycler. Good luck.