Normal sudoku rules apply. Neighbouring values along a green line differ in value by at least 5. Values on the whisper outside the main grid provide a hit points clue for their respective row or column. A valid ‘hit points’ clue sums the digits in its row or column that are in their corresponding numbered cell, for example a 3 in r4c3 would contribute to the clue in r4c0 and any other digit would not. All hit points clues are a minimum of 1. For the solution check to trigger please only enter small digits outside the grid.