I've made a simple prototype for a math quiz game. You have to move a horse following the chess rules, and do a "knight trip" sorting formulas by value.
I wish you tell me your opinion, if you think I could improve it and add more quizzes to it, or simply abandon the idea.
http://www.scirra.com/arcade/puzzle/5415/caballo-math
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I thought it was an interesting concept, however, I was terrible at it. With some spruced up graphics, you could have a nice puzzler on your hands.