25 rooms on a side
Twenty-five needs zoom on a phone. Expect several minutes if you clear every stub.
Fit view makes tiles tiny. Pinch or use the zoom control, then scroll the board. Fog at twenty-five is memory work; keep the right-hand habit if you lose the lamp trail.
The number is rooms, not pixels. Walls sit between rooms, so the drawing is 51 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.