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Logicsmith Exhibition 5: Polyominous

Would you like to try your hand at logicsmithing, and possibly be featured on my blog? Read on!

Your challenge is to compose a uniquely solvable 10x10 Polyominous puzzle. Your puzzle must have precisely 36 givens, arranged in a pattern with 180-degree rotational symmetry, and every integer from 1 through 9 must appear as a given exactly four times. You are only allowed to submit one puzzle, but you may change it at any time before the deadline. Send your puzzle to glmathgrant[at]gmail[dot]com.

This time around, Logicsmith Exhibition is also a contest! Once the deadline has passed, I will publish all of the puzzles I received without revealing the authors, and ask everyone reading this blog to cast their votes for their favorite puzzles (again via email). If your puzzle is the readers' favorite, you could win a prize!

By entering the contest, you agree to the following terms:
a) You agree not to discuss your entry with any other entrants or any voters until the contest is over.
b) You agree not to cheat the voting system.
c) You agree to provide me with a mailing address in the event that you win and wish to receive a prize, and to await said prize patiently, particularly if you live outside the continental United States. (In return, I agree not to use your mailing address for any malicious purposes, such as sending junk mail or other undesired things.) If you don't want to give out your mailing address, I reserve the right to happily give the prize to someone else who will.

After four weeks (meaning the deadline is August 3), I will post the puzzles that my readers and I have constructed, and give the readers another four weeks to cast their votes for the best puzzles. Good luck, and have fun!


Blaine said...

One quick question on the rules about 180° symmetry. If I were to place a 1 in the top left (square 1), I understand that means there would have to be a given in the lower right (square 100). But does it have to also be a 1? I'm assuming the *pattern* of givens is symmetric, not the value of the givens, right?

Grant Fikes said...

Correct, the pattern of the givens has to be symmetric, but the values do not. If the upper-left corner is a 1, the lower-right corner must be a given, but that given could take on any value from 1 through 9.

chaotic_iak said...

Although the givens are all 1 to 9, it doesn't mean that there may not be other values in the finished puzzle, right?

Grant Fikes said...

chaotic_iak: There are no restrictions on the use of numbers greater than 9 in the solution, so long as the solution is unique and the other conditions of the contest (including no givens greater than 9) are met.

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