Your little counter can pick and pop balloons and learn math along the way. Use the mouse to pick the numbered balloon that will help Moose reach Zee’s branch. For example, if Zee is two branches up, click on a blue balloon with the number 2 on it and Moose will float up to Zee! The second part of the game is helping Zee pop all of the balloons flying around the sky.
Source
http://static.nickjr.com/game/assets/nogg_balloonmath
Moose and Zee’s Balloon Math screenshots
