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.
you can't use the same gajin account if you've already done a different task with it. This is so extremely stupid please fix this because it just doens't make any sense at all.