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.
This game made my life because i played it so hard just for AI missions because fight against players is so freaking boring and i want have fun and because I played this game for so long I can say it is really good idea to download and start play :).