Delta 4 designed games between 1984 and 1992. Some were self-published, others were released by CRL Group, Piranha, Silversoft or On-line. Delta 4 were also credited with co-publishing Jonathan Nash's tape magazine YS2, issues 2 and 3.
Delta 4 was formed by McNeill with a few friends whilst still at school. Their debut text adventure games were the Dragonstar trilogy ("...like Classic Adventure but without the interesting bits.") and two Holy Joystick comedy adventures, self-published in 1984. Gilsoft's The Quill was the design software.
Their first critical success was Bored of the Rings, inspired by the Harvard Lampoon novel of the same name. Published in 1985, it received a Sinclair User Classic award. They also published Robin of Sherlock.
- Sherwood Forest (Delta 4, 1984)
- The Dragonstar Trilogy (Delta 4, 1984)
- Quest for the Holy Joystick (Delta 4, 1984)
- Return of the Holy Joystick (Delta 4, 1984)
- Bored of the Rings (Delta 4/CRL Group, 1985)
- Robin of Sherlock (Silversoft, 1985)
- Galaxias (Delta 4, 1986)
- The Colour of Magic (Piranha Games, 1986)
- The Boggit (CRL Group, 1986)
- The Big Sleaze (Piranha, 1987)
- Murder Off Miami (CRL Group, 1987)
- The Town with No Name (Delta 4/On-line, 1992)
- Psycho Killer (Delta 4/On-line, 1992)
- "Hit Squad". Sinclair User (45). December 1985. Retrieved 2007-11-27.
- "Delta 4 Software". World of Spectrum. Retrieved 2007-11-27.
- "Adventure". Sinclair User (40). July 1985. Retrieved 2007-11-27. "The humour can be fairly schoolboyish at times and there are a couple of occasions when it is both distasteful and unnecessarily unpleasant. On the whole though the game is great fun and well-produced too."
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