Normal sudoku rules apply. Digits in a cage must sum to the small clue in the cage's top left corner. The clue outside the grid gives the sum of the digits along the indicated diagonal. Digits cannot repeat along the main diagonal marked with a blue line. The grey square contains an even digit. Grey lines are palindromes ie they read the same forwards and backwards. Digits separated by a white dot have a difference of one. If two digits are separated by a black dot then one is double the other.
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