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Almost without fail, those who had done them had developed better problem-solving/reasoning skills than those who hadn't. My students who had done them consistently scored better on T/F questions, and if they didn't score better on the exams as a whole, it was out of shear laziness. Given what I've seen, I think all kids should have to do logic puzzles in school.

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Do you think it's possible that the same kids who did logic puzzles as kids had/have a better natural ability at solving them - and therefore enjoyed doing them more than those who struggled with them?

I'm not trying to make an excuse for kids who didn't do this as kids, just curious as to your opinion if this might be causation/correlation.