Numerous games avaiable on GOG are playable via ScummVM. Just install it on Mac and download the installer. This includes my beloved Monkey Island series including 1,2,3 and you might try 4 (status Bugged on https://www.scummvm.org/compatibility/)

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and other great titles like Gobliiins, Police Quest, King's Quest, Leisure Suit Larry, Indiana Jones, Sam & Max hit the road, The Day of The Tentacle and many many more.