At the start of every map, you will be given a moderate amount of visibility. With that given light, you have to pan around the map by using the arrow keys and memorize the map layout before moving. Once you press WASD, the light will immediately be turned off, and you will be only visible by a small glimpse of light left. With what you remembered, you have to navigate your way out of the dungeon. You'll die when you make a mistake after the lights turned off.