You complete Moon or Sun when one loop enters each room once, visits a uniform symbol type there, and alternates moon and sun rooms around the route. The engine evaluates the full position rather than relying on a visual shortcut or an unsupported solvability claim.
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You complete Moon or Sun when one loop enters each room once, visits a uniform symbol type there, and alternates moon and sun rooms around the route. The engine evaluates the full position rather than relying on a visual shortcut or an unsupported solvability claim.
Complete guide
Moon or Sun uses the independently implemented Nikoli Moon-or-Sun rules v1 profile (R452). Moon or Sun is a complete deterministic browser game whose distinct rules centre on a room-crossing loop that selects only moons or only suns in each room and alternates the selected symbol between consecutive rooms.
Moon or Sun opens from a versioned seeded position built for a room-crossing loop that selects only moons or only suns in each room and alternates the selected symbol between consecutive rooms. Its game ID, rules profile, and deal identity are stored together so restart recreates the same opening without a server request.
Every Moon or Sun action is checked against the current board, available material, and this defining restriction: the route may not re-enter a room or visit both symbol types inside it, even when the geometry would otherwise form a loop. Invalid, stale, or post-terminal actions leave the position unchanged.
You complete Moon or Sun when one loop enters each room once, visits a uniform symbol type there, and alternates moon and sun rooms around the route. The engine evaluates the full position rather than relying on a visual shortcut or an unsupported solvability claim. Near the end of Moon or Sun, recount the remaining obligations needed until one loop enters each room once, visits a uniform symbol type there, and alternates moon and sun rooms around the route. Check the boundary rule after every final placement or transfer because terminal status is enforced immediately.
A practical Moon or Sun plan is to preserve several legal continuations around a room-crossing loop that selects only moons or only suns in each room and alternates the selected symbol between consecutive rooms. Use the deterministic hint to inspect one legal action, then compare how it affects the documented objective before committing. A common Moon or Sun error is to ignore the boundary rule that the route may not re-enter a room or visit both symbol types inside it, even when the geometry would otherwise form a loop. Undo is useful for studying that decision, while restart deliberately preserves the original seeded position.
Moon or Sun has its own runtime and save identity because its rules require a room-crossing loop that selects only moons or only suns in each room and alternates the selected symbol between consecutive rooms.
the route may not re-enter a room or visit both symbol types inside it, even when the geometry would otherwise form a loop.
Moon or Sun stores its game ID, rules version, and seeded deal identity. Those values recreate the same opening locally without promising that the position is forced or winnable.