I don't know why they are not working but someone said it's not the best way to earn soul gem anyway. They take too much time for the payoff it gives. Also, stop posting useless comments please. It will get you ban and you will lose the XP gained that way. Just a friendly advice 
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
Mini games are fastest way to earn sg but they don't work these days. Can anyone explain?