Pocket Sudoku is free and open source software and therefore heavily relies on user contribution. The easiest way to contribute is by spreading the word. Tell your friends and co-workers about the game and help them getting started with it.
Another great way to help is by beta testing and filing all bugs you find and all new features you would like to see.
If you have a different native tongue than English, we would appreciate if you helped us translating Pocket Sudoku to your language. For instructions on how to do so, please contact us.
If you know any other ways of contributing or have any questions, contact us.