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.
Do not waste your money on it , it is rigged. I've played 10 consecutive rounds. 9 of those were white , when I was betting blue. And the 10th was blue because I bet white. This game is so rigged!