World War Z is a co-op shooter, with a unique hook of swarms of zombies that can pile up on top of each other to reach human survivors. According to VentureBeat, World War Z has sold 1 million copies in its first week. The game was developed by Saber Interactive and published by Focus Home Interactive.

Focus Home Interactive also stated that the game hit 70,000 concurrent players during its launch week. Earlier this month, we learned that Saber Interactive and Focus Home Interactive will be partnering in the future on multiple more games.

World War Z is available on Xbox One, PlayStation 4 and PC (on the Epic Games Store). You can check out the launch trailer for World War Z right here.

For more information on the game, here’s the official synopsis:

World War Z is a heart-pounding co-op third-person shooter for up to 4 players featuring massive swarms of hundreds of zombies and fast-paced gruesome action.

Battle swarms of hundreds of zombies in gruesomely spectacular firefights. Co-op story-driven campaigns. Fight other survivors in Player vs Player vs Zombies modes. Level 16 character classes and weapon upgrades to take on greater challenges.