I think that Sudoku is a wonderful app to test and showcase my skills as a developer. It is a simple game that everyone knows, but programmatically complex. It requires the use of complicated multi-dimensional arrays. Programming the ability to work within rows, columns, as well as the nine cubes on the Sudoku board is not a trivial task. Because Sudoku is both complex and easily understood, it is a great way for me to display my abilities as a software engineer.