They print a daily Kakuro puzzle next to the Sudoku in the British Guardian newspaper. I’ve tried to get into it, but I find it a lot more frustrating than Sudoku. Kakuro seems to either require a lot of memorisation (to learn the unique sets of numbers that can fit in certain combinations), or a lot of on-the-spot math (to work out what numbers fit), whereas puzzles like Sudoku and Slitherlink require a lot more “pure” logic which is what I find challenging.
I can’t remember if I’ve asked this before, but what about Futoshiki? :-)

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