There are secret ads in rotation in surf (when you view ads) at all times in Hungry For Hits. They may either hint you should click them, or they may say something about the site’s food theme or the owner, Klara. These ads don’t advertise anything, and you would never see them in any other traffic exchange.
If you see one that looks like it doesn’t really fit in with advertising, click it. If you have found one of the secret ads, you will get a pop up saying you’ve won a prize and what you have won. Prizes vary from banners and text ads to credits and even cash, and can be claimed twice every day. Prizes for finding these ads will be added to your account instantly and automatically.