Play games
Choose the game that interests you and play itfor free.
Complete the tasks
Every game has some tasks 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.
you have to look at it as a game of risk yes you can get good things from them at a cost that's lower than just buying the item off the store but you also have a risk of getting something that you don't want or need so if you have a particular item you want and aren't wanting to deal with the risk save up your gems and buy the item off gamehag store other than that let it roll and enjoy