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.
The best way to earn SG on this platform was to do quests in different games, since they gave the biggest payout when compared to other methods of earning Soul Gems. But, there are only limited amount of these games with quests. I can obviously count only 2 games which you can earn in total more than 2000 SG; Warthunder and World Of Tanks. Where are the other games? This has been the case since I first joined the platform, more than 5 years ago.