My understanding is that game mechanics are not copyrightable but they may be patentable, e.g. the US patent for Shadow of Mordor's Nemesis system (https://www

My understanding is that game mechanics are not copyrightable but they may be patentable, e.g. the US patent for Shadow of Mordor's Nemesis system (https://www.gamesindustry.biz/warner-bros-finally-secures-patent-for-shadow-of-mordors-nemesis-system https://www.gamesindustry.biz/warner-bros-finally-secures-pa...).