Company Houdah Software created these great apps:
Sudoku Uno: Unlimited Sudoku, ACTPrinter - Virtual Printer, Sudoku Duo: Dual Player Sudoku for iPad, Sudoku Uno: Stylish Sudoku for iPad, Tembo - Find Files, Sudoku Uno, Type2Phone: Bluetooth Keyboard, letZi - multi-device photo viewer (aka letSee), Tembo 2 - File Search, and others..