This is a Remembered Length puzzle.
This is on the bottom of the description page, but I’ll copy it here: the shading is just for aesthetic purposes and can be ignored when solving.
Tags: game, logic, problem, puzzle
This entry was posted on September 28, 2011 at 4:00 am and is filed under Remembered Length,  Wed/Thurs. You can follow any responses to this entry through the RSS 2.0 feed.
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Well that was refreshingly pleasant. I think I can get used to this new difficulty schedule.
Great puzzle. Really enjoy that type.
I liked this. Somewhat sad though as this was exact idea I had to introduce this genre to my blog.
Beautiful puzzle. I had some trouble with one of those earlier, but this one had excellent flow for me.
I just now realised that two adjacent parallel lines must go in opposite directions =\. After that it was smooth sailing.
I uneasily came to this same conclusion by inspection/assumption, without really figuring out a real proof – can someone give a quick explanation of why this is always the case? Perhaps it’s obvious.
I’m guessing this will help ease some of the trouble I’ve had with previous RLs..
It’s a topological thing. Think about how the loop has to circulate around the interior (or exterior) in the same direction the whole time. If it’s moving left on one side of the interior, it has to be moving right on the other.
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