You play this game as a zombie apocalypse survivor, seeking out supplies to survive, or as match against other players. A first person shooter, you start with a handgun and box of bullets, but can craft items or just pick them up from houses. You die often and can re-spawn easily. The game has crude graphics, typical controls, and basic action.
This 'game' is controversial since it was put together from pieces of the UnitZ developer kit under the Unity Engine. While FieldZ and Day Survival Begins did not make it past the Greenlight process, Uncrowded did and was sold as a cheap regular game on Steam. This called into question the use of these developer kits and the entire Steamlight selection process for indie game developers. Also, since developers make money on any card sold on Steam, selling the game cheaply and depending on the cards as a revenue stream has supported what is commonly seen as a Unity ripoff given legitimacy by Steam publication.
UnitZ is a "pre-made" playable game sold to developers as a base or starting point with the intent that they will modify the game, its world, enemies, layout, and add new features. It is NOT individual unity assets pieced together, but a full game in its own right. Since "pre-made" developer kit games are 'complete' games albeit 'bare-bones', many unscrupulous people have attempted to re-sell them - unaltered under a new name.
FieldZ: Attempted Greenlight and failed.
Day Survival Begins: Attempted Greenlight and failed.
PixelZ: Attempted Greenlight and failed.
Uncrowded: Made it past Greenlight.
Once Bitten Twice Dead: One of the few to change and alter the pre-made game. Changes are cosmetic only however.