Normal sudoku rules apply. There are nine Middler cells in the grid, one in each row, column, and 3×3 box, each containing a different digit. The value of a Middler cell is 5, regardless of the digit in the cell. If two cells are joined by a green line, the values of those cells must have a difference of at least 5. Cells joined by a V have values that sum to 5. Cells joined by an X have values that sum to 10. Cells separated by a white dot contain consecutive values. The values along the gray line read the same forwards and backwards.