Hi! My name is Chris Engle. I'm know for coming up with Matrix Games in 1988. These are now used by a number of militaries about the world for planning and training. I ran a small game publishing business from 1995 to 2015 called Hamster Press. In addition to Matrix Games I published a diceless miniatures game called Ritter. It is still available as a PDF on Wargame Vault. I now have a web page where you can get free Matrix Games - called "Free Engle Matrix Games" Here is the link. https://sites.google.com/view/free-engle-matrix-games/matrix-game-links
Matrix Games are now usable by all under a creative commons license. So if you want to make your own, DO IT!
I'm now largely out of the publishing business. I hope to spend my retirement years playing Zero Ed D&D and running miniatures games at conventions. I also still run Engle Matrix Games at Gen Con and Origins.
Here is a brief copy of the rules...
Matrix Game Rules: Start with a problem. Say what happens next. There is no order of play. Anyone can add to or alter what happens. All players may ask a player to roll if they don't like what they said. Roll 2d6. 7+ The action happens and cannot be altered. 6- It does not happen and cannot happen in the game. The game ends when the problem is solved.