With an In-App purchase it is possible to remove ads, unlock all frogs, unlock the use of an external monitor, unlock the use of Hue Lighting and unlock all levels.
1. Display the settings by pressing the Pause button at the bottom of the screen. 
2. If the Settings are not displayed, press the Settings button. 
3. Press the Unlock Features button to display the purchase screen. 
4. The make the purchase, press the Purchase button.
5. Enter your App Store account information and agree to make the purchase.
6. If you have already made the purchase, press the Restore Purchase button. You will not be charged again and the purchase will be restored.