Let's start with the freebies, shall we?
Mystery Case Files: Ravenhearst and
Fairway Solitaire:
https://store.bigfishgames.com/biz_dev/coupon.php MCF: Ravenhearst is a straight HOG, but is the beginning of the Ravenhearst-themed games. I did not like the look of this one AT ALL when I first saw it, but the story was compelling, and I'm glad to have been able to see the roots of the Ravenhearst saga. There are a lot of HOG scenes, interspersed with the now-famous door-lock puzzles, as well as finding new pieces of the story and jigsaw minis.
Fairway is a completely addictive solitaire game. If you need any help understanding the scoring, let me know -- I have it all typed out in my review ^__^
Linking to the PC version, but you can get both PC and Mac for free if you wish :D
<span class="bold">Awakening 1: The Dreamless Castle</span> -- Use the coupon code
MOBFREEAWAKENING Now, for recommendations, do you want ones that are only available on Steam, or do you want recommendations for Big Fish, too?