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.
Well, Its almost impossible getting SGs. Minigames usually dont give SG (prob bug) and it its hard just for 1 SG. You're given 5 SGs everyday. Which is alright. So our only hope are referrals, daily SG and the games (not the minigames)