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 played this game long time and I really liked pve because in many types of these games you can't players vs ''bots'' and it was really nice. Like game is p2w but still good, and has many good updates everytime.