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.
Right and wrong
Solve the set of simultaneous linear equations
Too Many Zeros, Dump Them!
Lights Out 13 - 5x5, three stages, x moves
Legend of Zelda - Rupee Count (Item Purchase)
Scrabble Scores - 7
Lights Out 2 - 5x5, 4 moves
Combined Ages 3 - Non-symmetric, n ≥ 3
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