FrozenPizza: Origins

Sorry: there won't be pizza any soon in this devasted land... FrozenPizza is a multiplayer action shooting game. Spawn randomly on a map, find a weapon, and stay alive! Scavenge building, explore map, listen carefully, and hide from your enemies.

FrozenPizza is highly customizable, you can alter existing weapons stats, create your own, and even craft your own maps through Tiled editor, which is very simple and well documented