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26 August 2010 @ 02:24 am
Friday Puzzle #64 - Shikaku and Masyu  
Two intermediate difficulty puzzles this week, both originally written for the Turkish Puzzle Championship (TBT) test as about 5 minute puzzles. Both are also indicative of what my next puzzle project will look like, with classic puzzles but different kinds of themes and (hopefully) fun solves.

Shikaku:
Rules - Divide the grid into rectangles along the grid lines so that exactly one given circle is inside each rectangle and so that the number in that circle indicates the total area of the rectangle. See also here.



Masyu:
Rules - Draw a single closed loop in the grid passing vertically and/or horizontally through the centers of the white cells. The loop must pass through every cell containing a circle. When passing through a black circle, the loop must make a 90 degree turn and must pass straight through the first cells encountered on each side of this turn. When passing through a white circle, the loop must go straight through the white circle, but must make an immediate 90 degree turn in one of the adjoining cells. See also here.

 
 
 
stigant on August 28th, 2010 04:00 pm (UTC)
Yeah, that was essentially my experience with the puzzle. I looked at what happens if the black pearls go in twice before I finally got it, but in both instances, my reasoning only went two deep. The third time, I finally saw the next step in that line.

(I did enjoy the puzzle... one's limit on how deep you can go on a backtracking expedition is always a personal preference, and I'm always trying to expand my own horizon.)