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Keycards are Pick Ups that let you in open some locked doors. You often acquire one by killing an enemy carrying it.
There are two types of keycards:
Blue Keycards are rectangular shaped. They let you in some locked doors. This is the more common type
Red Keycard are pentagons. They let you get to certain floors on elevators. This is the least common type. They are only found in the levels Fears Don't Lie and Everything We've Worked For.