Moon-or-Sun

Game Rules: Moon-or-Sun

Visit every room once along a loop. Take all its moons or all its suns, and switch symbol type each time the loop enters the next room.

Draw one orthogonal loop through cell centres without branching, crossing or revisiting a cell. Visit every room once, entering and leaving it once. In each room, visit all moons or all suns and none of the other type; visit at least one symbol. Successive rooms must alternate moon and sun, including where the loop closes. Blank cells are optional. Tap an edge to draw or erase; hold to mark or clear an X. Drag between cell centres to draw a straight run, repeating to erase. Sizes and counts follow current settings and clues; difficulty changes clues or deduction depth, never the rules.