This game was so awesome, so addictive, and super well-polished! The math was really cool, I love the loop of doing two kind of inverse mental calculations, it creates a nice ebb and flow that makes the game really rewarding and allows the player to develop that specific skill as they play, which is probably my favorite type of progression in a game. This game would probably be really successful in school systems. It makes math fun and who knows, maybe it improves mental calculation ability.