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.
don't get so mad about these chests, if they're supposed to give you good games (which means high price games) just with buying one or two, the site would be broken. i think they should raise some of the chests price and add extra chances for winning high quality games. yazdan regards