http://www.pcgamer.com/time-bending-fps-superhot-is-free-for-twitch-prime-subscribers/

I never got round to playing Superhot, the stylish FPS in which time moves only when you do. But this weekend I finally will (it's downloading as I type this) because it's the latest game that's free for Twitch and Amazon Prime subscribers. The deal runs until December 24.

If you want a full rundown you should click over to Phil's review, but essentially the game puts you in 30 or so different scenarios straight out of action films, outnumbered and outgunned. If you stand still, so does time, but if you move the scene jolts into action.