video game, Postal 2, first-person shooter, dark humor, open world, PC, Windows, Linux, Mac OS, single-player, multiplayer, aggressive gameplay, controversial content, Unreal Engine 2, interactive environment, sandbox style, mature audience, explicit violence, crude language, adult themes, free-roaming, action, exploration, inventory system, health meter, comedic elements, absurd scenarios, satirical tone, player choice, consequence system, dynamic AI, moddable, Steam release, cult classic, Running With Scissors.