Back 4 Blood has announced details of its first expansion, with Tunnels Of Terror launching this month.In a Tweet shared by Back 4 Blood, it’s confirmed that the Tunnels Of Terror expansion will launch April 12 and will feature an all-new co-op activity known as Ridden Hives.

As for the Tunnels of Terror expansion, it's included with Back 4 Blood's Ultimate and Deluxe editions, as well as through the Annual Pass. Players can also pick it up by itself, though pricing was not confirmed. The Tunnels of Terror add-on adds the Ridden Hives PvE activity, new playable Cleaners and Ridden, and additional character and weapon cosmetics, among other things.

Back 4 Blood: Tunnels of Terror's headlining feature is a new co-op mode called Ridden Hives, in which you and your team of intrepid zombie hunters go underground to explore seven unique dungeons of labyrinthine tunnels. Down there you'll face off against a whole new type of monster with spiky heads – Warped Ridden like the landmine-equipped Urchins, massive Shredders, and ferocious Rippers. You'll also get to play as these three new monsters in Back 4 Blood's PvP Swarm mode.

Tunnels Of Terror will also add new Warped Chests, Skull Totems, Legendary weapons, attatchements and over 15 new cards.The release of Tunnels Of Terror will also bring a free update for all players that will add a new difficulty setting called No Hope, offering “an extra level of challenge for elite players.”

Concerning the 10 million player milestone for Back 4 Blood, Turtle Rock boss Steve Goldstein said this is a "historic event" for the studio and the game.

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