I'm very much enjoying this game!!
Question about Level 51: is it actually an Ox or really a Cow? (Or a bull, I don't know these animals that well)
Also more serious question: Is it intended that, when marking off the numbers, that the A button can mark them and unmark them, but the B button can only unmark the numbers, but you can not mark the unmarked numbers when pressing B on them?
I think I've gotten used to it by now, but in the beginning I did occasionally try marking numbers with B and A interchangeably and expected both to work.
Other than that, everything has been working great and intuitively <3
P.S. Nr.30 and Nr.109 worked for me, just needed to use the Select Button