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.
Free to play, but extremely expensive to be competitive. All of the good ("premium") buildings cost real money. You need to spend $200+ to advance very far. On the plus side: the graphics are nice