Unfortunately thanks to cases like <https://en.wikipedia.org/wiki/Tetris_Holding,_LLC_v._Xio_Interactive,_Inc. https://en.wikipedia.org/wiki/Tetris_Holding,_LLC

Unfortunately thanks to cases like <https://en.wikipedia.org/wiki/Tetris_Holding,_LLC_v._Xio_Interactive,_Inc. https://en.wikipedia.org/wiki/Tetris_Holding,_LLC_v._Xio_Int...> there doesn't have to be any direct code overlap for a game to be in violation.