You can use the "Amazon app store" to download app/games, which is a built in app.
But to install any games, off Google play, you have to install "Google play". Which can be done, without rooting the device, but isn't available in the "amazon app store".
That how I got Netflix to work on it.
Go to a web browser, on your Kindle, and search Google for "installing Google play on Amazon Kindle fire". Then just follow any of the many walkthroughs, on installing it.
You'll download three or four files, run them, then restart the Kindle.
Some features aren't available, but I haven't had any issues yet..
Because "amazon app store", doesn't have all the apps/games/etc, that are on "Google play", and vice versa.
It most likely won't run any of the high end games. But I do play fall out tactics and other simple games with no issues.