UNRELEASED GAME - CANCELLED
This game was cancelled in development.
The game was never completed and shut down in October 2018.
The game's development began after the original H1Z1 was spun off into two separate projects in early 2016: H1Z1: Just Survive and H1Z1: King of the Kill. The games were further split as separate projects in October 2017, with Just Survive dropping the H1Z1 name, and King of the Kill becoming simply H1Z1.
H1Z1 is a survival sandbox massively multiplayer online game [..]. The game is set during a zombie apocalypse in the rural United States, in which players will have to survive against the natural elements, hordes of zombies, and thousands of potentially hostile survivors through interaction, scavenging for resources, building shelters, and crafting.
Gameplay
The gameplay of H1Z1 emphasizes on multiplayer cooperation, trading, and team-building. In an interview with Adam Clegg from Sony Online Entertainment, he made clear that unlike other zombie massively multiplayer online games, the main focus will be about surviving against the zombies through teamwork with other players, rather than having a player versus player (PvP) environment with zombies as a backdrop. The ability to craft items has been implemented.
Source: Wikipedia, "H1Z1", available under the CC-BY-SA License.