KNIGHTS is scheduled to be released on Steam with trading card support on May 30, 2016. There are 5 cards in the series, and you'll receive 3 cards at random for purchasing and playing the game.
Trading Cards
Minimalism
Knight's Tour
Under The Tree
Symmetry
Simple
Foil Cards
Minimalism
Knight's Tour
Under The Tree
Symmetry
Simple
Badges
Booster Pack
Emoticons
Profile Backgrounds