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Back 4 Blood - Expansion 1: Tunnels of Terror (Base game required) 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 The top 3 reasons to play Back 4 Blood - Expansion 1: Tunnels of Terror Back 4 Blood is a thrilling cooperative first-person shooter from the creators of the critically acclaimed Left 4 Dead franchise. Fight your way through a dynamic, perilous world in a 4-player co-op story campaign. Choose from 8 customizable Cleaners, one of the immune survivors, and a range of lethal weapons and items. About Back 4 Blood - Expansion 1: Tunnels of Terror 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. Read more What are the system requirements? MINIMUM OS 64-bit Windows 10 Processor Intel Core i5-6600 (3.3 GHz) OR AMD Ryzen 5 2600 (3.4 GHz) Memory 8 GB RAM Graphics NVIDIA GeForce GTX 1050 Ti OR AMD Radeon RX 570 Storage 40 GB available space RECOMMENDED OS 64-bit Windows 10 Processor Intel Core i5-8400 (2.8 GHz) OR AMD Ryzen 7 1800X (3.6 GHz) Memory 12 GB RAM Graphics NVIDIA GeForce GTX 970 OR AMD Radeon RX 590 Storage 40 GB available space