How to play
You complete Round Trip Loop when the completed grid satisfies the crossing loop edge runs constraint set, every fixed clue, and the profile's whole-board completion test. The engine evaluates the full position rather than relying on a visual shortcut or an unsupported solvability claim.
- Round Trip Loop opens from a versioned seeded position built for The loop may cross orthogonally without retracing; outside clues give the nearest horizontal or vertical segment length. The independent runtime records this exact crossing loop edge runs rules identity. Its game ID, rules profile, and deal identity are stored together so restart recreates the same opening without a server request.
- Every Round Trip Loop action is checked against the current board, available material, and this defining restriction: The loop may cross orthogonally without retracing; outside clues give the nearest horizontal or vertical segment length. Partial assignments remain legal only while at least one completion still satisfies those constraints. Invalid, stale, or post-terminal actions leave the position unchanged.
- You complete Round Trip Loop when the completed grid satisfies the crossing loop edge runs constraint set, every fixed clue, and the profile's whole-board completion test. The engine evaluates the full position rather than relying on a visual shortcut or an unsupported solvability claim.
Strategy tips
- A practical Round Trip Loop plan is to preserve several legal continuations around The loop may cross orthogonally without retracing; outside clues give the nearest horizontal or vertical segment length. The independent runtime records this exact crossing loop edge runs rules identity. Use the deterministic hint to inspect one legal action, then compare how it affects the documented objective before committing.
- A common Round Trip Loop error is to ignore the boundary rule that The loop may cross orthogonally without retracing; outside clues give the nearest horizontal or vertical segment length. Partial assignments remain legal only while at least one completion still satisfies those constraints. Undo is useful for studying that decision, while restart deliberately preserves the original seeded position.
- Near the end of Round Trip Loop, recount the remaining obligations needed until the completed grid satisfies the crossing loop edge runs constraint set, every fixed clue, and the profile's whole-board completion test. Check the boundary rule after every final placement or transfer because terminal status is enforced immediately.