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.
06R#4-0BWT9-X#T8X ;
Just replace the # with the missing letter.
Actually, it's a Complimentary reviewer package, which can activate one of these games (and their DLCs to them in some cases), such as: Athopiu, Occult (reRaise, preRaise, etc.), Arcane (reRaise, preRaise, etc.), Asset Flip Simulator, Triggering Simulator, Zambi 2 Kil.
I'll leave the thread opened for feedback if you take it; there are some users who take keys silently, although such packages are well-spread. Plus, maybe someone will be honest :)