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.
Can someone please tell me what hero level 15? In game, your account doesn't have a level the only thing from what I can tell that has a level is your commanders, is this what they mean by hero level 15?