Yes but, its says free they worked hard on getting the things, and now we need to work hard to get those prices and rewards, there is no problem with the prices.
how do i know it iss not a scam
I'd say a solid 8/10. It's easy enough to earn soul gems and the prices for things seem fair, however I feel like earning XP is wayyyy too slow.
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.
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I rate it 7/10 cause there are some bugs.