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.
For me it would be Steam gift cards that use RM, if you don't know what I am talking about let me explain. RM is a type of currency used by us Malaysians. It stands for Ringgit Malaysia and when compared to the US Dollar, you would see that Ringgit Malaysia is 4 time cheaper then US Dollar. That is really cheap given the fact that most games I've seen cost 20-50 Rm per game. But you have to be careful when your using a Malaysian steam gift card outside of Malaysia because from I have heard some of them are region locked.