I just tried it and it was easy. Click on a game's link and it started almost instantly. Faster than if those games were on my laptop. Plays right from the browser and goes full screen automatically. Very easy. Not the best game offerings, but hey... They're free.
Luna (Amazon's cloud gaming service) is available on all devices you own including: Windows PC, Mac, Fire TV, Fire tablets, Chromebook, iPhone, iPad, Android phones, and select Samsung Smart TVs. Luna supports the Luna controller and other controllers like Xbox One, Playstation 4, and mouse + keyboard. Youcan use your smartphone as a controller with app (ios and android). No waiting for lengthy downloads—just play.
- Play games up to 1080p/60fps (depending on ISP speeds)
Luna games that are FREE to play, with Prime subscription, and change monthly. Current games are:- Beach Buggy Racing 2 - Hot Wheels Edition
- Lumines Remastered
- Monster Truck Championship - Rebel Hunter Edition
- Jackbox Party Pack 2
https://luna.amazon.com/
Luna+ is subscription based and has
over 100 games available. It is currently $9.99/mo after a 7-day FREE trial.
https://www.amazon.com/luna/channel/B085TRCCT6
https://www.amazon.com/luna/landing-page 
12 Comments
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Now that Stadia is going away this is a reasonable substitute, too bad I can't use my Stadia controller with it wirelessly.
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The opportunity to get these games added to your library is time sensitive so making people aware that they are available is helpful. Once you saw "Prime membership" in the title you should have moved on and sulked elsewhere.
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https://news.ubisoft.co
You can technically sign up for Ubisoft+ and play on Luna without a gaming PC.