Yes, this is a duplicate question. Anyway, to answer your question, it's true, you will get a certain amount of Soul Gems for levelling up.
Edit: I lock this thread.
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
Sorry iff this a duplicate question on the forum.