Moon-or-Sun (adapted from Nikoli)
- Draw a line to make a single loop.
- Lines pass through the centers of cells, horizontally, vertically, or turning. The loop never crosses itself, branches off, or goes through the same cell twice.
- A rectangle, bordered by bold lines, is called a "room".
- Color each room blue or yellow.
- The loop must visit each room once, alternating between blue and yellow rooms.
- In a blue room, you must visit all of the moons and none of the suns; in a yellow room, you must visit all of the suns and none of the moons.
Modified 3 years, 6 months ago
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$\begingroup$ Seeing the misunderstanding and all that, I'd like to ask clearly: passing through a room WITHOUT a sun or moon counts as part of the sequence? (Ex: Can't go moon-moon but can go moon-blank-moon?) $\endgroup$– BelhenixSep 2, 2019 at 17:37
2$\begingroup$ A suggestion for rephrasing the rules to account for empty rooms: "Color each room blue or yellow. Draw a loop visiting each room once, alternating between blue and yellow rooms. In a blue room, you must visit all of the moons and none of the sums; in a yellow room, you must visit all of the suns and none of the moons." $\endgroup$– Deusovi ♦Sep 2, 2019 at 19:46
2$\begingroup$ Welp, got to admit that indeed the original rules may confuse the solver when they are given empty room. For @Belhenix , that's correct: can't go moon-moon but moon-blank-moon is okay (if the second room doesn't contain any sun). And Deusovi , I like and agree with the suggestion, will update the rules accordingly. $\endgroup$– athinSep 2, 2019 at 22:45
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