UniSudoku screenshot

Announcing UniSudoku for the iPhone®
First popular on the Mac, the same great game is now available wherever you go on your iPhone® or iPod Touch. Enjoy 10,000 puzzles of five different difficulties or enter your own from a game book, website or newspaper. As with the Mac version the interface gets out of your way for Sudoku bliss: make pencil marks with a tap on the number pad, double tap to complete the square and press and hold a digit to highlight it on the board.

Only at the iTunes App Store.