World’s Worst Pet is a free app that exposes you to over 1,000 words through four engaging games. Your mission is to help bring home Snargg, the world’s worst pet, who has run away. To get Snargg back you have to fill his food dish by learning new vocabulary words. The games are fill-in-the-blank, synonym identification, antonym identification, and definition identification. Ask your parents if you can downlaid this free app. Let us know what you think of the app and post your comment below.