Is there are a reason why the ZX Spectrum and Commodore 64 versions are separate games in the database? Otherwise it should be merged.
My guess: different genres. One is interactive fiction with graphics, the other interactive fiction without graphics. If this requires two different entries is debatable.
Overall, it would be a good idea to mention non-obvious version differences like this in the description to avoid confusion. ("In contrast to the C64 version...")
Oh yeah, I overlooked that aspect. Well, makes a bit more sense then, if our policy is to keep the two separate.