Hmmm
This stuff works, I did it last month and got Overlord 2
Ye they've had some good giveaways, Ryse, Cities in Motion, Men of war assault squad to name a few 
Worth doing if you like the game. Free is free 
thanks you mate
Thank you :p
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
https://www.gamesessions.com/zz/Game/ZombieArmyTrilogy - Tried to post this yesterday but GH wouldn't let me. Play for 5 Mins and it's yours to keep, Activate before 14 Nov 2018 (10AM UTC). (Not a steam key)