King's Quest VI - AGI YouTube Videos
Not so much a game to play, but more of an experience.
Corvat Chauve Souris has recreated the fabulous KQVI in AGI format. Unfortunately, it's not available to download\play anywhere. But at least we can watch it on YouTube.
It's an unfinished Work In Progress that ends when Alexander meets the druids, but I think it still deserves to be shown.