Normal sudoku rules apply. Identical digits cannot be a knightâs move apart. Along thermos, digits increase from the bulb. Cages show their sums. In the original puzzle, three given digits are shown as pencil-marks. After the puzzle is finished, erase all the digits apart from 1s, slide the 1s 3 cells to the right, or 6 cells to the left, and re-solve the puzzle ignoring the pencil-marks!