https://www.gamesessions.com/zz/Game/PainkillerHellAndDamnation
Must be logged into free account, download game, play for 5 minutes to keep for free. Regularly $19.99.
GIVEAWAY ENDS ON 8 NOVEMBER 2017 (10 AM UTC).
This is a site similar to Steam or Origin that allows you to play full demos through their access service. This is the Single Player version of the game. They give an option to buy a Steam key ONLY if you want the game in your Steam library and/or multiplayer, otherwise you DON’T need it to play single thru Gamesessions. 15 Gig install.