While at Disney, I worked inside a group dedicated to helping children learn while playing online games.
We started from first-principals of both game design and education, producing a number of games, often inside the kid's MMO Club Penguin.
Some of the games we made topped the Club Penguin charts over their non-educational counterparts, reaching millions of players.
This game was designed to build intuitions around different physics and math concepts including friction, levers, and momentum.
This is a fan made video walking through some Pufflescape levels