Indie dev thatgamecompany is beloved for its unique game designs. From flOw to Journey, the studio has surprised gamers by offering something truly unique.

So... why did they make a multiplayer zombie shooter? "Gravediggers" is the result of one of the studio's 24 hour game jams. The goal, according to studio co-founder Kellee Santiago was "to see how much fun we could generate in 24 hours."

According to The Verge, Gravediggers is one of the three extra games to be included in the Journey Collector's Edition. Here's a video of the game in action: