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.
72 hours after the task completed (13 days in the making!!) and no rewards. I'm worried this is the third game in a row not to pay out any gems at all (or exp which is what I really need to get to lvl3).
Play with caution!