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.
lol so let me start, the free weekend was on overwatch (17-20 nov) and i played, but when it "ended" i was still able to play and its 22nd and i can still play it, many people claimed to having that glitch for next few days (its probably a problem with time) and i actually decided to buy it for 50% off because black friday sale, so who wants to play :D ?