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 like the game but sometimes it is very confusing, because there is not much info about what to do. I liked fallout 4 more and its story. Wish they made a similar game to fallout 4 and just add that you can play with friends not completely change it to multiplayer based.