DualShaper

The tutorial never says the left and right shapes must go in the left and right halves of the silhouette respectively. This plus the choice of semicircles and circle can mislead the player to think there's a secret rule making some answers right or wrong.

This is fun, but some of the asymmetrical aspects of the shapes are so subtle that guessing is a more effective strategy than actually paying attention/thinking fast. I think this would be better if the shapes were designed to look less symmetrical.