FA-86377 / Procedural level generation constraints / Member archive

Level reachability flood fill: Start cell is not counted · case 02

An enclosed start reports zero reachable cells.

Member previewVariant 2 · 3 implementations · 8 checks per implementation

Case contract

grid rows of '#' wall, '.' floor, 'D' door (passable), '~' water (passable only when swim) and 'E' exit. From start [row, col], 4-neighbour flood fill. Returns {reachable: number of reached cells including start, exit: whether an E cell was reached}.

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
diagonal gap only #1	`{"exit": false, "reachable": 0}`	`{"exit": false, "reachable": 1}`	Failed

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This record includes three runnable implementations, regression fixtures, execution results, and source hashes.

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