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.
Sadly Social Empires doesn't exist anymore but there are always new games which we can play. I prefer strategy games and action games. This one is good.