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.
Its a game for browser... but its a shitty one... as a layer you cand do much thing... everything is already done and you are looking at a game that is playing itself...