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 only think in this game everything is worth the question is to bring the rhythm on the piano to be skillful with the fingers when playing it to have high concentration