From Ripcord Games:
After coming home from work to find his house repossessed, the player-character, known as Postal Dude, decides that everyone is out to get him and goes... well... postal. He figures that everyone in town has been infected with something that makes them all psychopathic killers. Paranoia can be fun. The game gets under way with Postal Dude standing outside his home, unable to get inside but armed to the teeth nevertheless. Go figure. Moving from one surreal landscape to the next, you must make use of the twelve weapons at your disposal in order to dispatch anything with a pulse. The goal in each of the 16 levels is to off a given percentage of the "hostiles" (that is, cops, soldiers with missile launchers, rednecks with huntin' rifles, etc.) without getting killed yourself. Pretty simple, really. There are no magic power-ups, no special abilities - just you, your arsenal, and the occasional Kevlar vest or first-aid kit.