Light

There is light in the dungeon. Each square is either lit or unlit. Within the range of your vision, you can see any monster or object on a lit square. This works even if the monster or object is on the other side of a room, and even if you must look past some dark squares. Corridors are usually dark. Rooms can be lit or unlit; the frequency of dark rooms tends to increase at deeper dungeon levels. Occasionally, entire dungeon levels will be dark, particularly in branches such as Gehennom or the Gnomish Mines.

• Walls and closed doors limit your vision. You cannot see into another room, unless you look through a suitable passageway.
• Light is useless when you are blind.
• There are ways to cause darkness, such as by using a cursed scroll of light.
• Some locations, such as under water, cannot be lit. You can light the inside of a vortex, if engulfed, but there is little reason to do so.

There are ways to make more light:

• permanently, with a scroll of light, wand of light, or the spell from a spellbook of light.
• temporarily, by switching on a oil lamp or magic lamp. (Sometimes you might want to switch it off again, because lamps reveal your location to monsters.)

See also

• light sources
• infravision
• yellow light