Cancelled Spectrum release
A Spectrum conversion was advertised but never released.
On the Apple II version, there is a fatal bug in the code for level 6. If the chandelier hits the machine at the exact moment that the first frame of the electric arc is being drawn, the code accesses a bad pointer and overwrites memory until the game crashes. The authors were clearly aware of the issue, and placed a check in the one other place where it can occur, but missed this one.