Challenge Accepted: What you know you don't know
There's an old card game called Mao, and the whole gimmick is that when you teach someone to play, you're supposed to start off with a simple statement: "The only rule of Mao that I can tell you is this one." You can be told when you're breaking a rule, but not what the rules...
Known unknowns, etc.
Honestly, the fact that games get away with a whole lot of not providing information is one of those things that shouldn't work but does. It's an aspect of game design and challenges that I find fascinating, and sometimes it's intensely frustrating, but at other times it speaks to a high degree of cleverness and gives you incentive to play better and with more creativity. I do, however, think that the idea of choosing between two elemental spells when one is the right answer and the other isn't is still garbage. Enjoy!