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.
In 2019 or 2018....
To get the rewards, I achived level 20 but the reward was not guaranteed and the chance disappointed from this web. And, I am staying at level 25 (the top level) with the recurring tasks everyday.