Experts are special Lifelines. Each Expert has a different set of knowledge, and can help you answer different questions. To learn how skilled the Expert is in each of the game’s 8 categories, tap on the Expert in the Expert tab on the Who Wants To Be a Millionaire home screen.
You'll unlock a special Legendary Expert (with a gold background) once you've collected all of the other experts from a city. Legendary Experts are especially skilled in many areas, and are a great help on your quest to millions!
Tip: Common Experts tend to excel in one category, while Experts of higher rarities tend to be more rounded.