The Elemental Shooter

In 18970X the year of less population. Only 4 people were able to survive. The others died because of dehydration and hunger. Corpses were everywhere. The 4 last people were in some kind of game. They got trapped there. All they got was guns, knives, and other weapons. Creatures and entities where everywhere, wild, and has the tend to kill. The only thing was the moon will crash into earth after 3 days 46 minutes. They should do everything before the moon crashes into earth's surface.

"Your love was like a loaded gun, You shot me down like everyone"