Love it but one little flaw!
To achieve this, just make a closed loop that goes through a sun country and then a moon and then connects back up to the sun.
Otherwise brilliant app!

This is a logic puzzle game where players draw a single loop following specific rules within a grid of rooms. The loop must visit each room once, passing through all moon cells or all sun cells within a room, and alternating between moon and sun rooms.
1.1
December 4, 2016
This app has been updated by Apple to display the Apple Watch app icon. bug fix
MoreIn Moon-or-Sun, you draw a single continuous loop that must enter each room only once. Within each room, the loop must pass through all moon cells or all sun cells, and you must alternate between visiting moon-focused and sun-focused rooms.
No, Moon-or-Sun does not contain advertisements. The game is completely free to play without any interruptions from ads.
Moon-or-Sun offers a vast library of over 10,000 puzzles. All of these puzzles are accessible without any payment required.
Moon-or-Sun is available on iPhone, iPad, and iPod devices. It is designed for iOS users who enjoy logic-based gameplay.
Yes, Moon-or-Sun has an age rating of 4+, making it suitable for younger players. The game's logic-based challenges can help develop problem-solving skills.
The provided information does not specify if Moon-or-Sun can be played offline. However, as a logic puzzle game, it is likely playable without an internet connection.
The latest version of Moon-or-Sun was released on December 4, 2016. The game was initially released on November 16, 2016.
The primary objective in Moon-or-Sun is to successfully draw a single, unbroken loop that adheres to all the game's specific rules regarding room entry and cell completion.