FA-86644 / Procedural level generation constraints / Member archive

Boss room selection: Doors are one-way · case 04

Rooms behind doors listed backwards are never considered for the boss.

Member previewVariant 4 · 3 implementations · 8 checks per implementation

Case contract

Rooms 0..n-1 joined by two-way doors [a, b]. The boss room is the reachable room (other than start) with the largest BFS door distance from start, ties to the lowest room id. Returns [room, distance] or None when no other room is reachable.

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
door listed backwards #1	`null`	`[1, 1]`	Failed

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