Moon or Sun

Moon or Sun is a Nikoli puzzle genre.

  • Draw a loop through some cells of the grid.
  • The loop will pass through each region exactly once.
  • In each region, the loop will either:
    • Pass through all suns in the region (at least one sun), and no moons,
    • or pass through all moons in the region (at least one moon), and no suns.
  • In this path, the loop will alternate between passing through suns and passing through moons.