Rush Hour

During the recent holiday period, I was introduced to a puzzle game called ‘Rush Hour’. It’s very simple: a 6-by-6 grid is populated along rows and columns with cars and trucks; the player must manoeuvre a car to the exit by sliding the other vehicles out of the way, moving everything only either forward or backward. The reader should attempt a few configurations from this online implementation by Fred Vonk (hat-tip to a nonetheless thin-on-content Wikipedia article) before reading further.

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