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 remember the days when I played Flee the facility. I would play it all the time, It's like other games didn't exist X'D. I do play Flee the facility once in a while, but not always :D