Description: Hudson Soft presents "SUDOKU vol.04", loaded with new contents and the update version of the best catalogue of "SUDOKU vol.01", tagging with Nikoli, the originator of this world famous puzzle! It's not only solving puzzles. This fun puzzling game gives you feelings of art and beauty. The gameplay is well designed and coordinated for the touch screen with experiences of video game developing, so even if you are an old fan accustomed to using a pen and paper, you will have no stress to start playing and enjoy the puzzle right away. Plus, we created "Tutorial Mode" for the beginners, so everyone can learn the game step by step. You can also play the puzzle switching around the landscape and portrait mode of iPhone/iPod touch,according to your mood. And upload your high score to the website "Do the Hudson!!()", then check your world ranking. Challenge to the world record of "SUDOKU"!