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.
No wonder my secondary build is so much fun. I was playing on the PTS and upgraded my DM. Donskoi and then I notice the secondary guns looked familiar. They look pretty close to what Guanghe has for secondary guns. Went on to my main account and it looks like they be a slight older version of the same guns.