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 have already bought a 10€ steam gift card and im looking to buy another 5€, but they are out of stock. How often do GameHag re-stock?