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That puzzle contains only white circles. Black circles were introduced in Puzzle Communication Nikoli #90, and the puzzle was renamed Shiroshinju Kuroshinju (白真珠黒真珠, meaning "white pearls and black pearls"). This improvement deepened the puzzle and made it gain popularity.
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 ...
Example of a Killer Sudoku problem Solution to the example above The same example problem, as it would be printed in black and white. Killer sudoku (also killer su doku, sumdoku, sum doku, sumoku, addoku, or samunanpure サムナンプレ sum-num(ber) pla(ce)) is a puzzle that combines elements of sudoku and kakuro.
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If there is a white region that does not contain a number, and there is only one possible way for it to connect to a numbered white region, the sole connecting pathway must be white. Some puzzles will require the location of "unreachables"—cells that cannot be connected to any number, being either too far away from all of them or blocked by ...
The 27-cube snake cube puzzle laid flat (top) and packed into a 3×3×3 cube (bottom, exploded view) – cubelets with straight holes are outlined [1] The snake cube is a mechanical puzzle, a chain of 27 or 64 cubelets, connected by an elastic band running through them. The band runs straight through certain cubes, but bends 90° in others ...
A number of methods of solving Kuromasu puzzles exist. Any cell with a number in it must be white; this is very important. For example, a 2 cell with another numbered cell next to it would be visible from the 2 cell, and no other cells can be visible from the 2 cell. Therefore, all neighbouring cells to the 2 cell must be black.
Black cells may not form a diagonal split across the grid nor a closed loop; any cell that would complete such a "short circuit" must be white instead. More complex puzzles require combining Rule 1 and Rule 2 to make progress without guessing; the key is recognizing where the cells must assume one of two checkered patterns and one leads to a ...