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.
Its task is difficult compared to others, but in terms of the game itself, it's okay gameplay wise, it has slow progression and requires a lot of patience.