Scratch Game Ideas

I think I want to create a trivia math game. Each time the player gets the right answer, the character moves closer to the finish line (like a race). They have to answer so many questions in a certain amount of time. If they don't answer fast enough, the other character wins.

The second idea I have is to make a puzzle game. Something like "magic squares", where each column, row and diagonal equals a "magic" number.