I’ve become a bit obsessed with this variant of sudoku. Normal rules apply with the added proviso that numbers lying along a thermometer increase from the bulb to the tail, (they do not have to be consecutive, so 2,4,7 along a themo is OK, but 2,7,4 is not). I think this is the best puzzle of any sort I’ve tackled, I can’t magine how the setters go about creating them.
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