Couple of weeks ago I had created a Sudoku Game in Silverlight and dressed it up in iPhone's theme, I even posted the code on Codeplex. Now, yesterday with some time on my hand and WP7 expectations running high I took the same codebase and by just changing the main view's XAML in Blend, I re-dressed it in WP7's theme. It's not pixel perfect and the animations need work, but I think we have a reasonable WP7 metro-theme inspired implementation in something that took less than 3 hours of work. Moreover, the iPhone version and WP7 version apart for the visuals are absolutely the same, the backing ViewModel code is without a single change and they both offer the exact same functionality. This is a testimony to both the benefits of a MVVM design (even with games) and also to nRoute framework, upon which both these demos were made.
View the Window Phone 7 Series Version: http://www.orktane.com/nRoute/WP7Sudoku/
View the iPhone Version: http://www.orktane.com/nRoute/Sudoku/
Note: The WP7 Sudoku demo makes use of "Segoe UI Light" font, and it must be installed on your machine else it will default to the Silverlight's portable font.
Finally, please vote below for which ever design you think is better.