[antognini]

This is very cool and fun to play.

Another interesting variant is incomplete information Tic Tac Toe which was posted by SMBC: https://www.smbc-comics.com/comic/incomplete

[eaplmx]

I enjoyed playing a few rounds of Probabilistic TTT, and 'Incomplete Information Tic-Tac-Toe' sounded interesting too.

After thinking about it last night, I made a quick version this morning, and I think it's fun to play as well: https://eapl.me/incomplete/