Comment by edjw

I've been playing around with making a version of tic-tac-toe that's interesting to grown-ups. Experimenting with rules a lot as you'll see. (I think 1357 is probably the best but not sure.)

https://5-by-5.edjohnsonwilliams.co.uk

https://github.com/edjw/5_by_5_tictactoe