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 basically when I go to games I see aprox. 10 games that I can complete but then when I click on Sao's legend and scroll down to the list of similar games I see game that wasnt in the list before. This brings the question- how many games are here and how can I view them all?