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.
Does anyone face the error "Offer is not available"? I contacted with Misty and they said that they are trying their best to fix it but that was a week ago... :(