Normal sudoku rules apply. No two adjacent cells (orthogonally or diagonally) may contain the same digit. No two cells which are a camel's move away from each may contain the same digit. (A camel’s move is 3 cells orthogonally and one cell at right angles - so the digit in r1c4 may not be in r2c1, r4c3, r4c5 or r2c7.) Grey lines are palindromes: cells the same distance from each end contain the same digit.A white dot connects two consecutive digits. A black dot connects two digits in a 1:2 ratio. Not all possible dots are shown.
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