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.
I see a lot of people saying that the game is bad, but I don't get the reason why? I played it and I think it's a good game. Not the best but I like it.