What is Proper?

Humans are curious creatures. Even when cards are randomly lined up, we can't help but find patterns. Which card is most fitting for the ""?"" space...If you look closely, you start to see it, don't you? In this new kind of gaming experience, you'll think about beautiful sequences. When you compare your thoughts with others', you might be surprised by how much you have in common or be impressed by their unexpected ideas. An intriguing outcome awaits!