So last week i started developing a multiplayer game and its tic-tac-toe. I have finished implementing and you guys can play in different devices and I try to make it as smooth as possible. for the backend, i just used appwrite subscribe functions to get real time data. and the play with AI feature is a bit under development lol because it keeps on stuck at thinking but I am trying to make a robust mechanism to make it work. eskeza please do check it out. You can share the link or even the game Id and you can even play rematch.
https://tic-ta.vercel.app/tic-tac
https://tic-ta.vercel.app/tic-tac