What's the Most Difficult Question for Designers?

When I hear stories about people finding joy in my games, that means the world to me. If your cat's Walter and Biddy could design a game, what would it be like? It would be a dexterity game about knocking things off of other things. Do you ferrets do that too? They do it with their nose, you know? So the first thing is when they get to a place that you don't expect to,. You're like, how did he even get up there?