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.
How often gamehag do restock steam wallets? when i get 3000 sg i'll buy it but it says "this reward is currently unavaliable"