Broken Sign Blog
#009: Rail Pool
6 May 2022This was one of the first Rail Pools with question marks. They allow for a lot of interesting logic, and I’m really happy with how the visual theme turned out here.
Solve it online:
Rules: Draw a non-intersecting loop through the centres of all cells. Some boldly outlined regions contain number clues. If a straight loop segment visits any cells of a clued region, its length must match one of these numbers. Each number must correspond to at least one such loop segment. Question marks represent any positive integer, but numbers cannot repeat within a region.