I bought the full verision of this on PC a few years back after playing an STA demo when I was a kid. The ST version is much better in every way. This game is a great puzzler with a unique idea although the security card is SO annoying! There was a windows game with bouncing balls which is similar, I can't remeber the name though.
First saw this game on the program Games Master which set me on a search to find it which I finally did. Main thing I remember was the copy protection which involved identifying a grid from a chart printed very pale blue on a small card to avoid photo-copying, very difficult to see.
