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.
Who else played this game when was around this year and had a lot of fun ? Btw i am not playing it anymore but I have really good memories on community of this game :).