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.
Downloaded War Thunder for the gems. Actually played it for a while was pretty fun at first but it eventually gets pretty boring. Like when you die three times in a row because of some guy with a fully automatic gun yeah since I'm going to hit him with my one bullet shooting tank when he's going super sonic.