In 2010, the National STEM (science, technology, engineering, and math) video game challenge was created as part of President Obama's initiatives on STEM education. The $50,000 grand prize was taken by a Flash game called "You Make Me Sick!" created by Dan Norton and Dan White of Filament Games.

I was pretty impressed with the game and though it's short (not that much gameplay), it's much more in line with how educational games should be done. 

In “You Make Me Sick!”, my mission as a disease was to try to infect an elderly man (key characteristics: he’s a mouth-breather with many vaccines). I decided to create an airborne bacterium - airborne because his mouth-breathing would be an easy entry vector for my disease, and bacterium because viruses would have a harder time due to the vaccines my target had.

Mission #1 was to plan my attack. I had my bacteria blow in from the open window, and had to play a little minigame to guide myself into my target's mouth while he was breathing in and out. I succeeded after a few minutes of frenetic clicking and encountered another minigame involving infecting the target's lungs, hopping from alveolus to alveolus.

The game ended afterward (hence my complaint about it being too short), but it was definitely engrossing and was a great way to teach kids how an infection actually happens.

This sort of game, that's fun for its own sake and has real learning value, is what the educational game field should strive for.