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.
For Nostale, What is the :basic" class, for Vikings how do you engae in PVP and for Ogame: how do you build a base on your home world and upgrade it?