Get ready for a brain-busting good time with "What Came First." This free iPhone game, developed by Psycho Bear Studios, challenges your knowledge of historical discoveries and inventions.

In this game, your goal is to tap the photos or pictures in the order they were discovered or invented. For example, you would tap a caveman before tapping a space shuttle. With categories ranging from pop culture to video games, you'll need to use logic and your trivia skills to succeed.

"What Came First" also offers a multiplayer mode where you can post on Facebook and ask your friends for help with challenging puzzles. If you make a mistake, don't worry! You can use the "Rewind" power-up to go back and choose again.

This brain trainer is suitable for the whole family and promises to give your brain a workout. Can you crack the top 100 on Game Center? According to a study, monkeys saw a 500% increase in quiz aptitude after playing "What Came First" for just five days straight. So, are you as smart as a monkey?

Take a tour of the game and tap the "GET" button to download "What Came First" now!