Here's a case on why Tetris is not copied as easily: https://publicknowledge.org/tetris-copyright-decision-shows-how-complicated-copyright-for-games-can-be/ htt

Here's a case on why Tetris is not copied as easily: https://publicknowledge.org/tetris-copyright-decision-shows-how-complicated-copyright-for-games-can-be/ https://publicknowledge.org/tetris-copyright-decision-shows-... Also, game mechanics can't be copyrighted but they can be patented: https://www.gamesindustry.biz/articles/2021-02-08-warner-bros-finally-secures-patent-for-shadow-of-mordors-nemesis-system https://www.gamesindustry.biz/articles/2021-02-08-warner-bro...