On the board "Robot Storage", which can be reached if the player goes through the Channel 7 TV station path, one of the robots in storage is intended to give a red key to the player on examination.
Mistakenly the line of code reads #put red key w instead of #put w red key, causing the required key to not be created and the game to become unwinnable without cheating.
This bug occurs in both the April 1993 release, as well as all currently preserved Software Visions ZZT Pack releases. It does not occur in the Jul 1994 release.
(Report entered by Dr. Dos, original report by The Green Herring)