Objective / Rules - Complete the grid. - Each number tells you how many White squares are reachable from that square, horizontally and vertically, in total, including the numbered square (i.e. the range). - You are not allowed to have two Black squares touching horizontally or vertically (diagonally is ok). - Any White square can be reached from any other (i.e. they are connected).
Mouse Usage Note: only when supported by your computer/device/browser/etc. Left-click = Blank >> White >> Black >> Blank. Right-click = Blank >> Black >> White >> Blank. Click a number to mark it as dealt with.
Checking If you click 'Check' the system will check for incorrect squares. If 'Show mistakes when checking' is checked they will be marked with a red X.
Uniqueness Each puzzle has exactly one solution, which can be found using logic alone and no guesses are ever required. If you think you've found another solution, then please double check the rules.