Tap the alien pet to add 1 click to Clicks and 1 click to Worldwide Clicks. If you have 5 clicks, you can tap the apple to add 1 food to Food and 1 food to Worldwide Food, but delete 5 clicks from Clicks. When you have food, it will multiply the number of clicks you have by the number of food you have. Worldwide Clicks and Worldwide Food will not be affected by the food's multiplication power, though.
I made this for day 4 of Scratch Week: To the Moon and Back.