Is it be legal to publish a Noughts and crosses game?
A quick search online indicates that Noughts and crosses is a several thousands years old, so it doesn't have any copyright.
I'd just like to point out if you plan to make such a game for practise, and not to publish it, you don't have to worry about copyrights or patents. If you want to publish it and earn money, I guess you know that there's plenty of noughts and crosses in the market already.
This is not legal advice.
You can copy:
You cannot copy:
- Art, sounds
- Other in-game content