Puzzle Description:

have a lot of fun with this puzzle!

#1: Jan Wolter (jan) on Jan 5, 2005

I didn't actually take the time to try to figure out if this puzzle has more than one solution, but I'm pretty sure you can't get there by logic alone. I had to guess.

OK, the solution *is* unique. If you know it is unique then it is readily solvable because of the symmetry of the clues.

You can solve this puzzle by logic alone, you just have to look 2 steps ahead.

Right - you can solve it using boundary logic.

Not sure what you mean by the term "boundary logic"

Jc is when you find the square to put in colour by eliminating those that can not be in coulor ( usualy starting by the edge)

Okay, so it's not necessarily boundary, but hte absence of a positive. That makes much more sense. Thanx, Q.

fun, but to easy

Unless you let the solver know that this puzzle is symmetrical from the start, there is absolutely no way to solve it using logic alone. By the way, this "smiley face" is very creepy looking.

This puzzle is totally solvable by logic alone like deskriped above.

Adam please classify your comment.

This puzzle although a bit tricky, is solvable by logic alone, without use of the symmetry. Had fun solving it, thank you!

This may be one of the larger and more precise fits to what's lately been called "smile logic." When you use that, there's really only one good place for the bottom 4. Then the rest solves vertically.

I started by solving the white spaces on the top 3 rows and it pretty much fell into place from there.

And Adam's right - it is kinda creepy. Reminds me of the evil clown in the fun house.

I did this one all over again. If you start edge logic on the 7 in either end column, starting at the top, you will see that neither one can start very high, since that would force the rows of 4s to overlap the columns of 2's under each eye.

Given our standards today, this one solves rather easily using edge logic with the 7 clues. It's always interesting to see the advanced solving techniques start to form (from reading the comments above). :)

Solved with logic, and without "smile logic", heh.

agree with gator. i did it using no symmetry logic and no smile logic and no look-ahead at all. simple edge logic and it solves out completely. i was baffled by the early comments until i noticed how old the puzzle was. i would have to say that reading the comments was MUCH more entertaining than the puzzle itself.

I want to start by saying I have the titles hid so I have no preconceived notion of what the puzzle will be before I start. I solved this puzzle using simple logic. I started at the top with the sixes. Then, looking at the row of 2s, I looked at the 4 and 8 on the bottom two rows and put the four in the middle and just worked up from there. The 4s in the middle were the last thing to fill in. Very simple to figure out and solve.

I think the smile would be less creepy if it didn't go so far up on the sides.

A little bit tricky, but not too hard. I really like learning the names of the different types of logic, and seeing how other folks solve things. I used boundary logic on the 7, and everything else slowly fell into place.

Goto next topic

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