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 finished voting for all 5 threads but I didn't get the 20 soul gems, is there something else that I need to do to complete it and get the gems?