Don't forget you can buy a monthly/yearly membership that gets access to everything. I don't suggest it though because the majority of players have stopped playing. High level players are incredibly difficul to find anymore, however Kingsisle is fairly good at updating the game, but the gameplay gets repetative.
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!
Does the game still require you to pay to unlock everything?