EnjoySudoku.com - Sudoku for your iPhone

Enjoy Sudoku is quite simply an application to play sudoku on your iPhone. It is pretty basic with a few options and a new puzzle everyday.

They include a link to a site with instructions on strategies for the game as well as the basic rules. Each day a new game is offered for each of the six different levels. If you've missed a game, you can go back to any that have been available over the past week. A timer's included so that you can keep track of your time. When entering numbers, you select the number from the list at the bottom that you want to enter. Touching a blank cell enters that number into the cell. Alternatively, you can make it so that you can visualize all of the possible numbers at once, and by touching the numbers in the individual cells, they get eliminated as options for that cell. It's a basic program that allows you to enjoy the quick occasional sudoku challenge.