Debug page — every level the generator knows, straight from
levelOrder. Each preview shows the board as the player meets it, with
the first three taps tinted so the walk is visible. crowd is the
average count of other numbers within ±2 of one, which is what
MaxGap is for; step is the king-move distance between
consecutive numbers, which is never below 2. Both are measured from
the board rather than sent with it. The asset stamp and the PGSDK flavor belong
to the container, not to this game.