Rules & objective
Shade the number of cells shown in each room. Black cells cannot touch orthogonally and all white cells connect. An uninterrupted horizontal or vertical run of white cells cannot pass through more than two rooms.
Controls
Arrows select · Numbers enter · Backspace erases · U undoes
Worked example
Black cells cannot share an edge and white cells must connect. An uninterrupted white line also cannot pass through more than two rooms.