For launch Cut the Rope for IE9 features 25 candy-filled levels (with 7 unlockable in the game itself).
Unlock extra levels
Pin Cut the Rope to your Windows taskbar to unlock additional levels unique to this version.
Pinning to your taskbar is easy: Drag your Cut the Rope browser window by clicking next to the address bar - you should see the prompt 'Drag to taskbar to pin site'. Drag it over your taskbar to successfully pin it.