Play numerous free Sudoku puzzles online. The playing grid has a unique feature that allows users to highlight any squares in the grid. With the pencil mark option, users can employ advanced solving techniques in a convenient way. Also provides free printable Sudoku puzzles, solver, blank grid and solving techniques.

Sudoku Live is a gaming website devoted exclusively to the Sudoku number squares game. The site has been around since 2006, providing challenging Sudoku puzzles and a scoring system where players can compete against each other if they choose to.