The game was programmed by Jeremy Smith (co-author of Exile) and was developed originally on the BBC Micro. Superior Software agreed to publish it as a full price game but they required an Acorn Electron conversion (to release it as a joint BBC/Electron package). While this was being created, it was also ported to other systems beginning with the Commodore 64. All other versions were to be published by Firebird Software at a budget price. The C64 version actually made it to release a couple of months before the BBC/Electron version and became a number one best seller (hence the claim on the BBC/Electron cover).