Sudoku

Sudoku (; ; originally called Number Place) is a logic-based, combinatorial 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 digits from 1 to 9. The puzzle setter provides a partially completed grid, which, for a well-posed puzzle, has a single solution.

variant of sudoku

algorithm used to complete a sudoku

a technique for reverting a deleted node from a circular doubly linked list

British YouTube channel dedicated to sudoku, sudoku variants and other paper-and-pencil puzzles and cryptic crosswords