Touchscreen Sudoku: No more pen work!

Put away your pen and paper as you can now play Sudoku anywhere and anytime on a simple touchscreen.
The New York Times’ handy Touchscreen Sudoku compiles 750 puzzles which are clustered with complexity and the hint and undo functions allow you to try out with different moves. There is also a timer to test your speed.
I never have been good in mind puzzles but aficionados would not mind spending $20 for this nifty gadget.