You need to defend your gems from the bird monsters. Each bird monster has a number on it. You have to fire the feather on the bird monster using your cannon using your mouse. The bird you need to shoot is the one with the answer to each math equation. The cannon will shoot a magical feather to make it return back. Each level shows you different type of question and different type of challenge. Win all 9 levels to win the game. Clicking on wrong bird will take a life. If you lose all the gems in a level or lose all the life, the game ends. Have a marvelous time playing Math Defender!