Mickey's Adventures in Numberland

Mickey's Adventures in Numberland is an educational Nintendo game starring the famous cartoon character Mickey Mouse.

In this game, Mickey must collect all of the numbers from zero to nine in order to prevent the evil Pete from completely robbing Numberland. The five levels are: Number City, Number Factory, Space Center, Number Museum, and Pete's Hideout. Basic math questions must be answered in order to progress to the next level. There are three difficulty levels; players can only "die" on the hardest difficulty level. This adds a "traditional video game" element to a game that would otherwise be considered "purely educational."

Source: Wikipedia, "Mickey's Adventures in Numberland", available under the CC-BY-SA License.