I like the conceptis puzzles. I even implemented a solver in matlab for the Pic-A-Pix a long time ago. Not sure what happened to the code. At the moment, my favorite are the Slitherlink puzzles.
Conceptis does a good job with their site; I especially like the free weekly puzzles. They added a skyscrapers puzzle in the recent past, and someone has posted that problem to Cody, in case you weren't aware: http://www.mathworks.com/matlabcentral/cody/problems/2026-skyscrapers-puzzle. Also, you might want to find that code again, if you haven't already solved the two logic-art problems that have been posted: http://www.mathworks.com/matlabcentral/cody/problems/1700-solve-the-picross-easy and http://www.mathworks.com/matlabcentral/cody/problems/1701-solve-the-picross-hard.
Also, I'd like to see you post a slitherlink puzzle for solving or checking solutions. I'm not quite sure how to implement it, given the interposing matrices that the clues and slithering line would require.
Good explanations + Good tests = Good Problem.
The only thing I'd add to the problem description is that while all rows must be unique, and all columns must be unique, a row can equal a column and the matrix can still be "solved." Other than that, good problem.
Thanks, James and Jean-Marie. Your likes mean a lot. Also, I updated the description to specify rows are unique amongst rows and columns are unique among columns.
Spot the outlier
frame of the matrix
Lights Out 1 - 5x5, 3 moves
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Divisible by 8
Dice roll - opposite faces
Not square-free number sequence
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