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This question already has an answer here:

Is it be legal to publish a Noughts and crosses game?

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marked as duplicate by Philipp, Tyyppi_77, Vaillancourt Jun 1 '18 at 14:36

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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.

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This is not legal advice.

You can copy:

  • Mechanics

You cannot copy:

  • Art, sounds
  • Lore/transcripts
  • Other in-game content
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  • \$\begingroup\$ Even the mechanics item is fuzzy. See the case of Triple Town & Yeti Town. The clone used the same mechanics but all its own art & assets and still got in trouble for it. \$\endgroup\$ – DMGregory Jun 1 '18 at 11:43
  • \$\begingroup\$ @DMGregory interesting! I've just read up on it and to me it seems that they've copied a tad more than just mechanics. Their object hierarchies were copied too and to me that sounds like content. \$\endgroup\$ – Lolums Jun 1 '18 at 12:13

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