Comment by tajd
Looking at an ancient game called Trias/Ternii Lapilli and learning/using maths to figure out if it can be solved https://tom-dickson.com/blog/trias-game-investigation/
It’s similar to tic-tac-toe but slightly different of course.
Found it a great opportunity to learn about new areas of maths. Trying to figure out where to go next with it.