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.
Greetings! I apologize if I repeat what has already been suggested before - apparently, many threads have been removed from here and now it is difficult to find something related for sure.
My suggestion touches downloadable games having tasks on Gamehag. Adding the information I've mentioned will certainly take some time, but it will definitely help Gamehag users with an understanding of whether they can install a certain game to perform tasks for it or not, as the information will be at hand. It can also help (possibly) reduce the number of threads generated on related questions, since they will already be mostly answered :)
Thanks for your work and have a nice day!