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.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
so i waited 24 hours to open a chest and collected 3500 gems in the days it said to collect them in but when i got to open the chest it says i need to collect another 3500 gems why is that