His first experience with a computer was when he was 13, his first computer was a Sinclair ZX81 he bought in 1981.
In 2014 Ritman appeared in the documentary feature film From Bedrooms to Billions, which tells the story of the British video game industry from 1979 to its release.
- Namtir Raiders, Artic
- Cosmic Debris, Artic
- 3D Combat Zone, Artic
- Dimension Destructors, Artic
- Bear Bovver, Artic
- Match Day series, Ocean
- Batman, Ocean
- Head over Heels, Ocean
- Monster Max, Rare/Titus
- Super Match Soccer, 1998
Ritman also worked on two other football games that were not published:
- Final Whistle was developed for the Razz arcade system, but was cancelled as it looked like an improved version of Match Day II not suitable for arcade games.
- Soccerama was developed for Nintendo Entertainment System, but did not pass Nintendo's quality control due to bugs.
- Jon Ritman's website
- Interview with Ritman at crashonline.org.uk
- Ritman interview at computeremuzone.com
- Ritman interview at tacgr.emuunlim.com