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 really a good game but with all the things in the monitor it so torturing even if i hide it its still makes me awe (in a bad way). They should at least minimize it.