Rules & objective
Each number counts visible white cells horizontally and vertically, including itself, stopping at a black cell or the edge. Numbered cells stay white. Black cells cannot touch orthogonally. All white cells connect.
Controls
Arrows select · Numbers enter · Backspace erases · U undoes
Worked example
A clue counts itself and visible white cells along its row and column, stopping at black cells. Include the clue cell in that count.