The best iphone sudoku app is back with much more awesome features! Enjoy almost unlimited number of sudoku problems with beautifully refined user interface. (With Retina screen supports!) Basic Sudoku Rules Every row must contain the numbers from 1 to 9 with no duplicate numbers in each row. Every column must contain the numbers from 1 to 9 with no duplicate numbers in each culumn. A region (3X3 box) also has to contain the numbers from 1 to 9 with no duplicates. Features ======================================= Automatic Memo Mode For the sudoku biginners, Quick Mode with the automatic memo functionality is now available! Emotional Design Moonrabbit Sudoku's design perfectly blends with enhanced usability! You will be satisfied with one of the best emotional design. User-friendly interface Thanks to the optimized interfaces, you can focus on solving sudoku problems. Guide lines & Duplicated number highlighting will help you reduce time-consuming mistakes. Undo Undo helps the Sudoku problems be traced back to its previous state. You don't anymore need to resart the game from the bigining when you reallize you made a mistake in the middle of the game. Powerful statistics features You can check your records at a glance with the various types of graphs. Daily Sudoku & World Challenge Challenge people all around the world with a new sudoku problem every day. Massive volume Six levels of difficulty. Each level set contains one thousand sudoku problems. Various skins 25 background colors and two types of skin modes. Multilingual support Supports various languages. (Currently Korean and English.) ====================================== SOME TIPS 1. In Memo mode, press and hold the button to put numbers. 2. Hold undo button to reset the progress. 3. Double tap to switch between Normal Mode and Memo Mode.