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 have been playing for a while and so far the game has been quite fun the mechanics, the tanks, the graphic, and even the way the game is made in general is overall an absolutely pleasing experience. One of the greatest games I have found here.