Nevermind

Graphics

Some of the original game graphics had to be removed before the game could get a US distribution. Psygnosis' US distributors were particularly bothered about the 5-pointed pentagram-stars moving about in wheels, and some of the black candle graphics, since they said it smacked of black magic and they'd get complains from some Christian groups. The candles were re-coloured white, and the wheel had a new shape put inside it.

Also, after each level has collapsed when you complete it, just before the tube rises from the back of the now-flat plain to lift you to the next level, you can see that the last tile didn't clear properly and is a bit smudged. It's only there for half a second, but it's noticeable.

Maps

The game's programmer Ste Cork writes:

Only about the first half dozen or so maps were manually created. Without a map editor (and on a short deadline) it was hard work. After that, an automatic program was set up that randomly generated hundreds of maps overnight but culled 99% of them after testing for obvious issues. Each morning the shortlist of a dozen or so would be looked at and maybe half of them kept/added to the game. This continued for a few weeks until enough were generated to fill the game out.