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.
https://steamdb.info/app/1260400/
1. Click the green "Install" button to install the game.
2. Stop the download or download the game if you wish to play it, it'll be registered to your account anyway and can be downloaded anytime from your library.
Have fun !