Normal sudoku rules apply. Nine cells (one in each row/column/box) are negators, and have values equal to the negative of their digits. Each digit appears in exactly one negator. A clue outside the grid is the sum of the first X cells in the corresponding row/column, where X is the value in the cell nearest to the clue. If the value of X is negative, count the first X cells going in the opposite direction. For example, if R2C1 is a negative X-sum digit -4, the X-sum is the total of R2C1, R2C9, R2C8, and R2C7. Question mark clues are any single digit integers (-9 to 9). The cell with grey the square contains an even digit; the cell with the grey circle contains an odd digit. Digits cannot repeat along the indicated diagonal regardless of their sign.
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