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.
I personally think that most Filipinos play Mobile Legends that is my opinion. How do I think that? Because when I go to youtube and search Mobile Legends most of the youtubers are Filipino