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.
Someone here redeemed a Mastercard? If so, can yu describe what was the process? if you need registration to a website, documents etc in order to get the prize?