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2. Missing square puzzle - Wikipedia

   en.wikipedia.org/wiki/Missing_square_puzzle

   Animation of the missing square puzzle, showing the two arrangements of the pieces and the "missing" square Both "total triangles" are in a perfect 13×5 grid; and both the "component triangles", the blue in a 5×2 grid and the red in an 8×3 grid. The missing square puzzle is an optical illusion used in mathematics classes to help students ...

3. No-three-in-line problem - Wikipedia

   en.wikipedia.org/wiki/No-three-in-line_problem

   They proved that the maximum number of points in the grid with no three points collinear is (). Similarly to Erdős's 2D construction, this can be accomplished by using points ( x , y , x 2 + y 2 {\displaystyle (x,y,x^{2}+y^{2}} mod p ) {\displaystyle p)} , where p {\displaystyle p} is a prime congruent to 3 mod 4 . [ 20 ]

4. 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).

5. 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.

6. Numberlink - Wikipedia

   en.wikipedia.org/wiki/Numberlink

   In 1897, a slightly different form of the puzzle was printed in the Brooklyn Daily Eagle, in a column by Sam Loyd. [2] Another early, printed version of Number Link can be found in Henry Ernest Dudeney 's book Amusements in mathematics (1917) as a puzzle for motorists (puzzle no. 252). [ 3 ]

7. Hidato - Wikipedia

   en.wikipedia.org/wiki/Hidato

   Numbrix puzzles, which appear in Parade magazine, are similar to Hidato except diagonal moves are not allowed. [9] (vos Savant has only used 7×7 and 9×9 grids). [10]Jadium puzzles (formerly Snakepit puzzles), created by Jeff Marchant, are a more difficult version of Numbrix with fewer given numbers and have appeared on the Parade web site regularly since 2014, along with a daily online ...