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 average pubg player will most likely use just both their thumbs to play pubg mobile. But, a lot of "above average" players add up fingers to get a faster and accurate gameplay, starting from 3 fingers, heck, I've even seen 10 fingers you kidding? Anyway, how many?