The Oliver twins developed the game for the Amstrad CPC when they were age 17; it and was their first game published by Codemasters. Codemasters offered the brothers £10,000 for the game, because the company expected sell 100,000 copies with royalties of 10p per unit sold.
The twins worked on a single computer in a bedroom of their parents' house. Working in shifts, they coded for 18–23 hours per day; they took 30-minute breaks to allow the computer to cool. Sometimes, one brother coded on paper while the other used the computer.
The game was well-received by critics, and sold well. After Codemasters asked the brothers to produce another game, they developed Ghost Hunters, which Codemasters released in February 1986.