Description: Hudson Soft presents the best catalog of "Sudoku" for iPhone/iPod touch, tagging with Nikoli, the originator of this world famous puzzle. The gameplay is well designed and coordinated for the touch screen with the 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.