Regular practice is the key to improving your Sudoku-solving skills. The more you play, the better you get at spotting ...

Solve the grid in this hard Sudoku puzzle! The objective of Sudoku is to fill each row, column and sub-grid with exactly one of each number from 1-9. A conflict arises if you repeat any entry in the ...

Solve the grid in this hard Sudoku puzzle! The objective of Sudoku is to fill each row, column and sub-grid with exactly one of each number from 1-9. A conflict arises if you repeat any entry in the ...

They baffle, delight, and frustrate millions of people around the world on a daily basis. But even the most dedicated Sudoku-solver might have never spotted this secret pattern. Mathematicians have ...