Amazon Prime members have got until August 4 to download Battlefield 1 on PC for free.
All you need to do is sign into Prime Gaming and claim the digital product code. Once you've claimed the code you'll need to redeem it in EA Origin, which can be done via the Origin Store website or the Origin client on PC.
As Martin Robinson wrote back in his 2016 Battlefield 1 review, Battlefield's best stories have always been found when there are 63 other players screaming beside you. This World War 1 spin on the Battlefield formula results in an outstanding multiplayer, even five years later.