Settings

Sound Background music and the cats' meows. The speaker button in the corner of every other page turns the same thing on and off.
Show pointer Turn the mouse cursor into a pointing hand when it passes over a hidden cat. It follows the cat's exact outline, so with it on you can sweep the mouse across a scene and find every one without really looking - which is why it is off to begin with. Makes no difference on a touchscreen.

Reset all progress Forget every cat found in every scene and start the lot over. Your settings and the sound are not touched.