FA-86634 / Procedural level generation constraints / Member archive

Perfect maze validator: Union links cells instead of roots · case 04

Connected mazes are reported as loops or disconnected.

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
regression union linkage #1	`"perfect"`	`"loop"`	Failed

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