RULES : Classic Sudoku rules apply. Additionally,
Digits along the given lines read the same from either direction on the line;
If a grey circle is given between two adjacent cells, then the digits in those cells will be consecutive. Not all grey circles are given, which means adjacent cells without a grey circle may or may not contain consecutive digits;
Numbers with arrows outside the grid indicate the sum of the digits appearing in the cells in the corresponding direction. Digits may repeat in the direction of the arrow.










