For those times when you want to play sudoku on the iphone, but dont want a solver so that you can crack those hard puzzles yourself without temptation, try the Sudoku Collector App.
http://www.itunes.com/apps/SudokuCollectorWhile it can do the simple things that every suoku app can do out there, what it does different is that instead of giving you hints to solve the sudoku, it gives you tools that you can use to solve more easily.
Highlighting options to find those fish patterns more easily.
Coloring for simple coloring, multi coloring and chains.
Try and it and see.
See more at
http://sudoku.sravan.infoModerator: Please move the post if this is the wrong place.