Turtle Rock Studios made a big splash withLeft 4 Deadin 2008. The online co-op shooter’s marquee feature was the AI Director, which adjusted pickups and enemy spawns based on how well players were doing.Left 4 Dead’sspiritual successorBack 4 Bloodincorporates many of its predecessor’s features while also adding new ideas to the established formula.
One such innovation isBack 4 Blood’sCard system. These modifiers alter the game to make each playthrough unique. However, the feature may be a little opaque to first-time players.
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The game divides Cards into two categories: Active Cards and Corruption Cards.Back 4 Blood’sAI Directordraws Corruption Cards every level, which influences things like enemies, weather, events, and rewards. Meanwhile, players play Active Cards that provide various perks and bonuses to help players survive the zombie hordes.
Back 4 Blood Corruption Cards
The AI Director chooses Corruption Cards based on the difficulty setting and how well the players have performed in the previous Acts and levels. There are four types of Corruption CardsinBack 4 Blood, depending on what they impact.
Back 4 Blood Active Cards
AfterBack 4 Blood’sAI Directorchooses its cards, players draw five Active Cards from their deck and play one. This allows players to select cards that will counter or mitigate the effects of the Corruption Cards. Some Active Cards are direct upgrades to a character’s stats and abilities. Others offer a powerful buff at the cost of some penalty.Back 4 Blooddivides Active Cards into the following categories.
Players can unlock new cards either by finding them during a level or through supply lines. While some Cards are free, most Cards that players find in levels need to be purchased with Copper. Meanwhile,Back 4 Bloodplayers can Spend Supply Pointsto open Supply Lines back at camp. Each Supply line is a series of progressively more expensive unlocks. Players start with one Supply Line but unlock more after completing it.
Back 4 Bloodis out now for PC, PS4, PS5, Xbox One, and Xbox Series X/S.
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