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2. List of impossible puzzles - Wikipedia

   en.wikipedia.org/wiki/List_of_impossible_puzzles

   This is a list of puzzles that cannot be solved. An impossible puzzle is a puzzle that cannot be resolved, either due to lack of sufficient information, or any number of logical impossibilities. Kookrooster maken 23; 15 Puzzle – Slide fifteen numbered tiles into numerical order. It is impossible to solve in half of the starting positions. [1]

3. Yajisan-Kazusan - Wikipedia

   en.wikipedia.org/wiki/Yajisan-Kazusan

   However, unlike many of Nikoli's other puzzles, not all of the clue numbers are correct. Some contain values which are obviously impossible, while others simply contradict known values. In Yajisan-Kazusan, part of the solution is determining which clues are incorrect; any cells containing such clues must be shaded.

4. List of puzzle topics - Wikipedia

   en.wikipedia.org/wiki/List_of_puzzle_topics

   Chess puzzle. Chess problem; Computer puzzle game; Cross Sums; Crossword puzzle; Cryptic crossword; Cryptogram; Maze. Back from the klondike; Ball-in-a-maze puzzle; Mechanical puzzle. Ball-in-a-maze puzzle; Burr puzzle; Word puzzle. Acrostic; Daughter in the box; Disentanglement puzzle; Edge-matching puzzle; Egg of Columbus; Eight queens puzzle ...

5. 105 Riddles for Adults That Are Sure to Stump You - AOL

   www.aol.com/lifestyle/found-most-impossible...

   Q: What do the numbers 11, 69 and 88 all have in common? A: They all read the same way when placed upside down. Q: If 2 is company and 3 is a crowd, what are 4 and 5? A: 9. Q: I add 5 to 9 and get 2.

6. Slitherlink - Wikipedia

   en.wikipedia.org/wiki/Slitherlink

   Download as PDF; Printable version ... Loopy, Ouroboros, Suriza, Rundweg and Dotty Dilemma) is a logic puzzle ... as then two lines around the 2 would be impossible ...

7. Sum and Product Puzzle - Wikipedia

   en.wikipedia.org/wiki/Sum_and_Product_Puzzle

   The Sum and Product Puzzle, also known as the Impossible Puzzle because it seems to lack sufficient information for a solution, is a logic puzzle. It was first published in 1969 by Hans Freudenthal, [1] [2] and the name Impossible Puzzle was coined by Martin Gardner. [3] The puzzle is solvable, though not easily. There exist many similar puzzles.

8. The Hardest Logic Puzzle Ever - Wikipedia

   en.wikipedia.org/wiki/The_Hardest_Logic_Puzzle_Ever

   The Hardest Logic Puzzle Ever is a logic puzzle so called by American philosopher and logician George Boolos and published in The Harvard Review of Philosophy in 1996. [ 1 ] [ 2 ] Boolos' article includes multiple ways of solving the problem.

9. Fill-In (puzzle) - Wikipedia

   en.wikipedia.org/wiki/Fill-In_(puzzle)

   Download as PDF; Printable version; ... and other logic puzzles. [5] ... and see if an impossible letter combination results.