45 ROOM OF THE CLEANERS. A huge red lever is on one wall, next to a sign reading "Pull for cleaning service".
If the lever is pulled, a 10 foot by 10 foot section of adjacent wall will open and release a gelatinous cube created from a vat and kept in storage.
Vat Spawned Gelatinous Cube (AC 8; MV 6”; HD 4; #AT 1; D 2-8; SA Paralyzation, surprise on 1-3; SD Immunity to some attacks; XP 150 + 4/hp)
The wall section will then close back up, like an automatic door swooshing back into place, If this space is broken into, there is a ten foot room. The cubes are made underneath and raised by an elevator.
Once the lever is pulled, the cubes should be added to the wandering monster list, as one is released at uneven intervals. Returning the lever to the upright position does nothing, although the system can be turned off by the master control in Room 68.