FA-86629 / Procedural level generation constraints / Member archive

Perfect maze validator: Reversed duplicate passages are missed · case 04

A passage listed both ways is reported as a loop.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Cells (x, y) with 0 <= x < w, 0 <= y < h. First pass over passages [[x1, y1], [x2, y2]]: out-of-bounds or non-orthogonally-adjacent pairs -> 'invalid-edge'; the same passage twice in either orientation -> 'duplicate'. Then union passages in order: joining already connected cells -> 'loop'. Finally 'perfect' if all cells are connected, else 'disconnected'.

Why this case matters

Procedural generators silently emit unplayable or unfair levels when a single constraint check uses the wrong boundary, axis, neighborhood or update order; the defect is visible in exact generated geometry.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
reversed duplicate #1	`"loop"`	`"duplicate"`	Failed

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