POSTAL (Steam key/Region free).

http://store.steampowered.com/app/232770/
ake control of The Postal Dude in his infamous first outing as he battles to survive in a world gone mad! POSTAL is a classic isometric shooter filled to the brim with fast-paced explosive action. Crazed gunmen out for your blood await you around every corner, and your only choice is to get them before they get you. Fight back with a destructive arsenal as make your way through a violence-stricken town.

It´s time to go POSTAL!

Blast your way through 21 levels: Beginning from your humble Home, eliminate hostiles in areas from the Trailer Park to the City all the way to the Air Force Base.
9 devastating weapons: Defend yourself with varied tools of mayhem. Take aim with the Scatter Gun! Clear out rooms with Grenades, Mines, and the almighty Napalm Launcher! Whip out Heatseeker Rockets for those big groups!
Wide range of foes: Defend yourself from Molotov-tossing Grenadiers, gun-toting Infantryman, rocket-firing Heavy-Weapons Experts (don´t forget to duck!), and angry Ostriches!
Non-stop, guns-blazing, adrenaline-fueled action!