"Eurogamer: How much personal creative involvement did you have with DoomRPG, and what inspired you to do a mobile phone-only Doom in the first place?

John Carmack: Getting into this was really a sort of random event - a year ago, I rarely carried a cell phone, and it was just an old black and white clunker. When my wife gave me a new mid-range phone with a decent colour display and some bad game demos on it, I had my curiosity piqued a little about the platform. It turned out to be really easy to develop Java applications for the phone, so I played around a little bit and started thinking about what elements would make a good game for the platform.

I wrote a proof-of-concept demo of the basic rendering and play style, and then turned it over to Fountainhead Entertainment to develop into a full game. I did some additional programming work when we started on the BREW version, and I acted as the producer for the project."