When Zombies Attack

You open up the red door and are facing a staircase. It leads down to some kind of cellar or basement, not having anything better to do, you start down the stairs. It gets darker as you go farther down, and you feel the damp air stick against your skin. It gets really dark, so dark that you stumble as you step off the last step of the staircase, onto the concrete floor. You explore around a bit and notice an area with an orange glow. Tightening your grip on your sledgehammer, you begin to walk towards the source of the light.