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 have heard from a lot of people that they are playing this game on PC Emulator with keyboard and mouse. How many of you are doing this and are there any downsides?