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.
The game is a classic, I myself enjoyed it very much, it can really get boring at times, but at the time it had a very happy and interactive community, we Roleplayed a lot ,PvPd, and even now, it's more enjoyable having a friend with you while playing it.\
In the end, it's a good game, you should try it.