Play games
Choose the game that interests you and play itfor free.
Complete the quests
Every game has some quests for which you will receive Soul Gems.
Receive rewards
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
I found a fast way to earn 100-200.it will take u highest 30 min.U need a phone or a pc emualator such as Bluestack.now u need to download Gamehag from playstore then u need to look for the option (App Zone).now u need to watch ad till u get to the app ad watching limit.i get 100-200 sg form it everyday :).Edit=1AD=1SG 100AD=100SG 200AD=200SG