Codemasters offered the brothers £10,000 for the game, because the company expected to 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 to 23 hours per day; they took 30 minute breaks to allow the computer to cool.

[citation needed] After Codemasters asked the brothers to produce another game, they developed Ghost Hunters, which was released in January 1987.

[3] This reworked version was also released in 1993[3] for 8-bit and 16-bit home computers as Robin Hood: Legend Quest to avoid confusion with the original game.