> "Pieces can only move horizontally if there's nothing vertically adjacent to
them, and vice-versa. You win a level when you have no valid moves." - Author's
description [https://groups.google.com/forum/#!topic/puzzlescript/8slo6dXXSlQ]
Play here [http://www.puzzlescript.net/play.html?p=eb0f9102f85b5ea536b1]
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