31 rooms on a side
Thirty-one is the largest board NonogramGo will carve in the browser. Sit down for this one.
Room count R means R−1 open doorways and one route between any two rooms. Print desk can stamp the same seed on paper if the screen feels small. Marks still only count clean finishes.
The number is rooms, not pixels. Walls sit between rooms, so the drawing is 63 tiles across. Start is top-left; exit is bottom-right. Same seed, size, and mode rebuild the same corridors.
How to walk it
Arrows and swipe take a whole corridor and stop at the next fork. Yellow marks where you moved — not a solved path. Hint draws one solid arrow; Peek flashes the shortest route. Either leaves that run off local Marks.
Also: all room counts, make desk, print this size, right-hand rule.