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2. Ages of Three Children puzzle - Wikipedia

   en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

   The Ages of Three Children puzzle (sometimes referred to as the Census-Taker Problem [1]) is a logical puzzle in number theory which on first inspection seems to have insufficient information to solve. However, with closer examination and persistence by the solver, the question reveals its hidden mathematical clues, especially when the solver ...

3. KenKen - Wikipedia

   en.wikipedia.org/wiki/KenKen

   As in Sudoku, the goal of each puzzle is to fill a grid with digits –– 1 through 4 for a 4×4 grid, 1 through 5 for a 5×5, 1 through 6 for a 6×6, etc. –– so that no digit appears more than once in any row or any column (a Latin square). Grids range in size from 3×3 to 9×9.

4. Sudoku - Wikipedia

   en.wikipedia.org/wiki/Sudoku

   'digit-single'; originally called Number Place) [1] is a logic-based, [2] [3] combinatorial [4] number-placement puzzle. In classic Sudoku, the objective is to fill a 9 × 9 grid with digits so that each column, each row, and each of the nine 3 × 3 subgrids that compose the grid (also called "boxes", "blocks", or "regions") contains all of the ...

5. Mathematics of Sudoku - Wikipedia

   en.wikipedia.org/wiki/Mathematics_of_Sudoku

   For classical Sudoku, the number of filled grids is 6,670,903,752,021,072,936,960 (6.671 × 10 21), which reduces to 5,472,730,538 essentially different solutions under the validity-preserving transformations. There are 26 possible types of symmetry, but they can only be found in about 0.005% of all filled grids. An ordinary puzzle with a ...

6. Nonogram - Wikipedia

   en.wikipedia.org/wiki/Nonogram

   Now "backfill" 4 blocks (the number obtained in step 4), so that cells 3 through 6 are filled. From the right: Starting from the right, the clues that are to the right of the 6 clue must be accounted for. Starting from cell 15, count 3 cells for the 3 clue (to cell 13), then a space (12), then the 2 clue (10), then a space (9), then the 6 clue (3).

7. The ClueFinders - Wikipedia

   en.wikipedia.org/wiki/The_ClueFinders

   The first ClueFinders title, The ClueFinders 3rd Grade Adventures: The Mystery of Mathra, was released in January 1998, and The ClueFinders 4th Grade Adventures was released in July. The Learning Company used their new game as the prototype for Internet Applet technology, which allowed users to download supplementary activities from the ...