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 can't remember the last time I actually paid attention to an ad. One of the things about getting older I guess is you realise that no matter how good an ad makes something sound, it just means the ad is good, not necessarily the product. What do you think?