This software is an implementation of Mahjong solitaire for the iPod touch and iPhone in a native format. The aim of the game is to pick matching tiles, removing them from the board. You win when there are no tiles left. You lose when it is impossible to pick up any more tiles. If the application crashes, it counts as a draw. You can only pick up tiles that are not overlapped by another, and can be freely moved either left or right. You probably already know how to play. This is released as Free (as in Freedom) software, under the terms of the GNU GPL Version 2. Graphic design by Sarah Gleeson.

Get the source of the game here.

Use iPhone mods and hacks at your own risk! Installing 3rd Party iPhone apps requires you to jailbreak the iPhone before installing the native software and apps. You can use Installer.app for Mac OSX and iBrickr for Windows PC to do this. Browse the full list of all iPhone and iPod touch native 3rd party apps filed under the software category.

More info here