I found out about Hooda Math when the creator of the site posted a guest entry on Emanuele Feronato's Blog. Michael Edlavitch is a math teacher who made some educational math games while he was between teaching jobs. He made a website to host his games, and then decided to host other math-related games as well. Now he owns a successful niche Flash game site with 10,000 visitors per day! What interests me the most about this story is that Michael's games are based on the classic Apple II game "Number Munchers". Number Munchers was was one of my favorite games for the Apple II when I was a kid. I played it outside of school way more than I did inside. I was motivated by wanting to see how each of the different types of bad guys (called "Troggles", if I recall correctly) behaved. I also loved watching the humorous animated cutscenes you would earn after every few levels. Wanting to see more of those kept me playing for longer than I probably would have. Depending on your age, you may have played the Mac version of the game instead.