You collect nuts in all of the level s. To do so, you have to make Earl jump over obstacles using your mouse or keyboard. Some plants and animals help you in your quest, e.g: mushrooms and turtles but beware of dangerous plants and animals, such as cacti and lobsters. As soon as you've gathered enough nuts, you can come home and complete the level.
You earn points by collecting nuts. The more, the better! The Golden Nut is worth the most points (200), but is usually harder to get to than regular nuts.
If you collect a lot of nuts in quick succession, your Combo Meter will fill up. Once you've filled it up entirely, you'll be able to pull double jumps for a while (30 seconds).
If you're able to grab hold of the Golden Nut, you'll not only earn extra points, but also unlock some bonus content. This content can be viewed by clicking on Tools in the main menu.