Broken Sign Blog
#023: Rail Pool — "Power of 2"
17 June 2022I discovered this by accident while working on something else, but it made for a neat puzzle on its own. It turns out that 2-clues are particularly constraining in Rail Pool (and if a puzzle has any, they’re often a good place to look for a break-in).
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.