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.
There is a good way if you gift a daily missions to gain SG like comment on some thread or maybe creat a thread and speak about something.Things like this a missions that might courage people to do it while gainingexp they gain SG