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 play agency a lot because my friends like the map, but we dont get into games very quick and it isnt very popular. Let me know your opinions about the map...