Teaching chess web app similar to Majestic Chess Adventures ?

I'm looking for an online version of Majestic Chess Adventures.  Does anybody know of one?  (It is a method (system) for teaching chess in a video game format.)  I'm hoping somebody has ported it to the web or have put together something similar.

It is a good method in that the player only have to finish the game in order to improve because concept and practice are all wrapped into one game.  Unlike books and videos where concept is taught and then the player must figure out how to practice it.

If there's anything like that online, I haven't heard about it. I guess the CD version isn't an option?

Yes, the CD would be difficult because many have only macs and have limited computer skills.