The web site linked to by the App Store, www.subwayshuffle.com, doesn't even exist anymore, though we can still look at it on the Wayback Machine.
The game was created by +Bob Hearn, an MIT graduate whose thesis is suitably titled Games, Puzzles, and Computation. It's full of interesting material and well worth a read for anyone interested in complexity theory.
The play area is a graph with colored edges, which represents a subway map. Some nodes of the graph contain a colored dot, which represents a subway car.
The layouts are aesthetically pleasing, and nicely represented by thumbnails in the puzzles list.
The puzzles look deceptively simple, but solving them can be harder than it seems.
Most puzzles are planar, but some have intersecting routes:
Subway Shuffle Lite. It containins just ten sample levels. I'm pretty sure that after trying them, you'll want the full version.
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