Users have requested a bowling simulator for iPhone and iPod touch that offers a customizable spin effect.
Here it is !
Swing your arm and apply rotation to the virtual bowling ball
by tilting the device clockwise or counterclockwise as you would do with the ball in a bowling alley.
The influence of the applied spin-effect can be set in an option-screen.
Don't drop the device (or use the trick that is mentioned in the application help-text ) !