NP World

You plus this app is good.

This is Sudoku (Number Place) app and can enjoy 25000 puzzles free.

This app will satisfy it from a beginner to an expert with the high quality puzzle of 5 difficulty levels.

Key features:

- 2 input modes

- Pencil marks with auto fill / erase

- Auto save

- Undo and Redo

- Selected digit highlighting

- Incorrect entry highlighting

- Completed digit highlighting