SUDOKU MASTER offers 150 unique puzzles that beginners and experts alike will enjoy! A handful of tutorials will help you learn the rules and controls as you go, and handy features like Write Mode and Temp Numbers make Sudoku pleasantly user-friendly. Feeling confident? Then try your hand at Title Mode to work your way up from Rookie to Sudoku Master! All puzzles were created by Sudoku veteran NIKOLI Co., Ltd. with solving tips from the Godfather of Sudoku himself, Maki Kaji, offered between games.