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've already invited my two friends, It should be 2000gems for me, and 200gems for each of them, but neither I and my friends have receive gems, what's wrong with it