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 think the game is great, but once you play for a couple hours, there are no new things and each of the robots is exactly the same. If they would add new features it would be great.