Virus of ZZT

On the "Space Quest" board, the exit door does not zap its :touch label if you open it with the keycard, so if you touch it before it disappears, the initial "can't open" message will reappear and you will not be able to open the door legitimately (as the keycard flag has already been cleared).

Additionally, it does not appear you can beat this game legitimately, either, as the only apparent path through the game takes you to a dead end (board 30) and the apparent actual intended ending fight (board 19) can only be accessed through the editor

(Report entered by Dr. Dos, original reports by The Green Herring)