A new trailer for Left 4 Dead developer Turtle Rock's new shooter Back 4 Blood has arrived, showcasing the game's new rogue-lite card system. The studio has also confirmed important details about this system as it pertains to microtransactions (more on that below).

This card system is part of what's known as the "Game Director," which is an under-the-hood system that watches your actions, health, and choices. The Director then responds by "choreographing" the game world specifically for how you're playing. Turtle Rock says this allows for each playthrough to be different.

When you start a mission, Back 4 Blood will "deal" you a set of Corruption cards that are mutators that can do things like turn out the lights, add special challenges, and dispatch particularly lethal zombies to come attack you. Players then play their own cards in response to what they were dealt by the game director. You can choose a pre-made deck or customize your own based on your interests and skills.