[Boolbar] Found it. Issue 44 (June 1985), pages 56 & 61, with ads for Atari, Dam Busters and Lode Runner in between! Actually says here you wrote it in 1982... took a while to get it published then!
[Darren] Sure did, by the time they published that I was into writing games written in machine code. The Atari is in the attic, I wonder if it still works . . .
[Darren] No, they were purely for my own fun, since few games written for the old Atari 400/800 were any good ("Star Raiders" and "Mercenary" aside). I aimed for crude graphics, crude sound but very playable and increasing difficulty the longer you played.