> For example, after a few puzzles I ran into 9 4 + 2 = 9 ? , which is a bit silly. There's only one possibility, and only one given number, so the solution is trivial. And this was after solving ~10 of these.
I noticed this as well, but there's a non-silly subtlety that I think you and I both missed - this easy puzzle was the first introduction of the multi-digit concept. Everything prior had been single digits only.
I noticed this as well, but there's a non-silly subtlety that I think you and I both missed - this easy puzzle was the first introduction of the multi-digit concept. Everything prior had been single digits only.