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.
I am wondering how Gamehag decides what quality skin you get, e.g. FN, MW, etc. Do they randomly choose, or do they just choose the cheapest one?