15 levels from easy sudoku, to difficult sudoku using X-wing and XY-wing etc.

Over 100,000 games in 15 levels.
In this app, there are various Sudoku puzzles that everyone can enjoy.
Of course, Sudoku PRO is free to play !

★Introduction★
Sudoku is famous for fantastic brain games.
Sudoku PRO is a fun and entertaining app 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.

◆PRO◆
Includes techniques familiar to advanced Sudoku players such as X-wing, swordfish, jellyfish, and XY-wing, with explanations that even beginners can easily understand.
High-level puzzles can also be solved using these techniques by using items.

◆About Function & Items◆
★ 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.
★ Auto Pencil-mark
└ It is a function to automatically enter all pencil-marks.
★ Check Mistake
└ It’s a function to check your answer.
★ Marker
└ It’s a function to find a hidden blanks or number.
★ Technique Hint
└ It’s a function to give you a hint when you have no idea.