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.
So i started playing, i reached 10'th castle level (you need 11) and i just noticed there is one more condition for completion, the winning starter pack. Do you need to buy it?