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 had the impression that on the beginning it was pretty balanced (I was one of the best players) but when I got better and better I got more noticeable that players that have better weapons could defeat me allot more easier than before. I know that the point is buying weapons but I simply didnt get enough money to buy new ones ;-;