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.
My first mistake in this app is picking Girl X Battle as my first go-to quest to complete (never knew they have a policy of removing quests) My second mistake is pay a little in this game to speed up the progress, which in the end was pointless as the quest is gone and I earn not even a cent back of what I invested. This kind of game for sure will take at least a month to complete for its quest, no idea why it was removed early, perhaps I was the late one here.