I dabble a bit in recreational mathematics. As well as probability analysis (see the program Monaco) I used to be one of the Brain Twisters puzzle setters for New Scientist magazine, until they went industrial. But you'll need a subscription to see them - mine and others' - here. (I might add some of the better ones here in the future, if I can.)
I also have had a paper published in the Mathematical Gazette that arose from playing with the ball and sticks toy Geomag. Unfortunately the published version is paywalled (I couldn't afford the open access charge) but I can report the originally submitted version . The biggest change in the published version was to add a reference to this website.
Last modification: 27th October 2026 (first version).