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.
I'm about to hit 600 soul gems and level 3 (don't laugh on my soul gems because it is harder to gain soul gems in my country) so I am thinking to buy skins but then I saw that some good looking skins available on cases So tell me should i buy cases , there is no soul gems or runes in there only skins.