Sudoku – Take a journey to feudal Japan
With Sudoku you can say that you are taking a journey into the feudal  Japan . With good  graphics and killer features, this application is the best Sudoku available for iOS.
DUAL KEYPAD ENTRY
You have two separate keypads, one for entries and one for notes which will allow you to enter values quickly and easily.
SMART NOTES
The  auto-notes feature brings all of the notes into the puzzle for you and keeps them updated as you succeed. If you feel that to  much help is not necessary , the optional smart notes feature  deletes  automatically the values from notes you have introduced  manually when they are no longer valid.
ERROR CHECKING
The optional error checker it will always tell  you when an incorrect or illogical value has been entered, giving you the possibility  to catch errors early and to prevent needless frustration.
MULTIPLE DIFFICULTY LEVELS
5 difficulty levels, from easy to insane, guarantees that you will find a puzzle that matches with  your skill level.
via @148apps