Sometimes a floor in the lower section of the mine (floors 81-119) will have greatly increased spawns of [[Red Mushroom|red]] and [[Purple Mushroom|purple]] mushrooms. These floors will also notably have a variety of colored lanterns which usually includes at least one green lantern.
Note that no mushrooms will spawn on an elevator floor (floors ending in 0 or 5) or if the floor is infested (see previous section.) Additionally, the mushroom floor is neither unique nor guaranteed -- there may be multiple active mushroom floors or no such floors at all on a given day, and that situation may persist for several days or weeks.