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.
I clicked on the "Play for free" button and then I can choose to "play for free" or "download game". I went for "play for free" to register an account. Do I need a promocode to get the Emden or is it enough to register via the link?