Big Thinkers was a short line educational games from Humongous Entertainment, which revolved around Ben Brightly and his sister Becky Brightly, two characters with the ability to shapeshift into any object they desire, whom the player interacts with while exploring the house and playing mini-games to earn stars of one of five colors: Red, Blue, Yellow, Green, and Purple. Each color represents a different category of education, such as yellow representing art. Upon collecting a large amount of each color, the player then has a chance to attempt a longer mini-game to obtain a larger dull orange-colored star wearing a square academic cap (as well as sunglasses in First Grade). The game is never-ending.
Source: Wikipedia, "Big Thinkers (video game series)", available under the CC-BY-SA License.