100 Years Sudoku

100 Years Sudoku with 100 year's worth of puzzles!-Num of puzzlesEveryday, you get a easy puzzle and a hard one.You can solve not only today's puzzle but also past day's puzzle.You can go back to 1950/1/1. So,there is many many puzzles.-DifficultyThere are two kinds of difficulty. Easy or Hard.-Input buttonsNumber buttons."∀" button for all inputs."?" button for a temporary mark."X" button to delete."<" and ">" buttons to move.You can solve puzzles comfortably.-Accomplishment displayHow many puzzles you have solved are displayed by month or years.-What is Sudoku?Sudoku is a kind of puzzle.Fill 9x9 cells with numbers from 1 to 9.The numbers in a 3x3 cells should be different each other.The numbers in a row should be different each other.The numbers in a column should be different each other.