Classic 9x9 grid Sudoku with four levels of difficulty - for beginners and advanced players.

Classic 9x9 grid Sudoku with four levels of difficulty - for beginners and advanced players.

A challenging twist injects extra complexity to classic sudoku.

A challenging twist injects extra complexity to classic sudoku.

This mobile version of the old Chinese tiling puzzle features more than 300 shapes. It's challenging - for kids and adults!