I just can't do them! I am really good at math, took 3 quarters of college calculus, got A's, but can't even do Monday's easy sudoku puzzle. What is wrong with me? I know the alleged tricks, but they only help me a little.
It takes me several days to ever do one, which is very seldom. I try almost every day. My neighbor, whom I don't consider exceptionally bright, can do them easily. Why can't I?