Tunnels of Terror features the all-new PvE areas “Ridden Hives", along with 2 new playable Cleaners, new Legendary Weapons, 12 weapon skins, new cards, 8 premium skins, and the fearsome Warped Ridden to discover below the depths of Evansburgh.

With the launch of Tunnels of Terror, players can explore Ridden Hives. These labyrinthine tunnels promise incredible goods to those that brave its depths, but be warned--Ridden infest these passageways and there are new mutated strains that will hunt you down.

Expansion 1 includes:
All-New Ridden Hives PvE Activity
2 New Playable Cleaners
3 New Warped Ridden
8 Exclusive Character Skins
12 Exclusive Weapon Skins
15+ New Cards
+ More

Back 4 Blood is a thrilling cooperative first-person shooter from the creators of the critically acclaimed Left 4 Dead franchise. You are at the center of a war against the Ridden. These once-human hosts of a deadly parasite have turned into terrifying creatures bent on devouring what remains of civilization. With humanity's extinction on the line, it's up to you and your friends to take the fight to the enemy, eradicate the Ridden, and reclaim the world.

Cooperative Campaign

Fight your way through a dynamic, perilous world in a 4-player co-op story campaign where you must work together to survive increasingly challenging missions. Play with up to 3 of your friends online or go solo and lead your team in battle.

Choose from 8 customizable Cleaners, one of the immune survivors, and a range of lethal weapons and items. Strategise against an ever-evolving enemy bent on your total destruction.

Competitive Multiplayer

Play with or against friends in PVP. Switch between playing as a Cleaner with special perks and the horrific Ridden. Both sides come with unique weapons, abilities, and specialties.

Extreme Replayability

A new "rogue-lite" Card System creates different experiences each and every time, putting you in control to craft custom decks, roll different builds and undertake more demanding fights.

The Game Director is constantly adjusting to player actions, ensuring exciting fights, extreme gameplay diversity, and tougher legions of Ridden - including mutated boss types up to 20 feet tall.