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.
if you have 999 gems you should really buy Warhammer 40,000: Space Marine its a great game and a great deal...its 29$ on steam and only 999 gems on gamehag