But even the most dedicated Sudoku-solver might have never spotted this ... A Sudoku is a puzzle involving a 9x9 grid into ...

A Sudoku puzzle consists of a 9x9 grid of squares ... and it's up to the solver to figure out how to fill in the rest of the squares to get to that end state. Mathematicians love counting things.

Sudoku improves problem-solving, concentration ... Sudoku is a logic-based number puzzle played on a 9x9 grid. The objective is to fill in the grid so that each row, column, and 3x3 box contains ...