https://www.gamespot.com/articles/10-free-pc-games-for-amazon-twitch-prime-members/1100-6460392/

All month long, Amazon has been giving free PC games to Amazon/Twitch Prime members in an effort to build anticipation for Prime Day. The Prime Day sales event doesn't officially begin until July 16, but free games--plus a few other deals--are available right now. All told, 21 free games will be offered to Prime members in July, and 10 are available right now.

To get your free games, you'll first have to link your Twitch and Amazon Prime accounts. Then head to Twitch.tv and click the crown icon next to the search bar. That opens a drop-down menu where you'll find your free games, along with any other freebies you haven't collected yet. Just note you'll need the Twitch desktop app to access the games.