60,000 games in 6 levels. You can enjoy it anytime anywhere. Of course, Sudoku Diagonal is free to play ! ★Introduction★ Sudoku is famous for fantastic brain game. Sudoku Diagonal adds a new rule of diagonals to popular Sudoku. You can enjoy this new type of Sudoku more. Sudoku Diagonal is a fun and entertaining apps to help you develop and maintain brain abilities such as memory, concentration and reasoning. That’s ideal for brain training as well as for killing time. ◆About Function◆ ★ Auto save └ It’s a function to save a data when you leave a puzzle unfinished. Continue playing anytime. ★ Undo, Redo └ It's a function to retrace your steps. ★ Pencil-mark └ It’s a function to write down small numbers in the cell. ★ Check Mistake └ It’s a function to check your answer. ★ Marker └ It’s a function to find a hidden blanks. ★ Technique Hint └ It’s a function to give you a hint when you have no idea.