this is made of AWESOME.

It's an online, interactive quiz that's geared toward middle-school-aged kids, but I was enthralled. In addition to math, science, geometry, and English questions, each level has a task you must perform before you can see the questions themselves. The animation is beautiful. The music is fun and quirky, though it can get annoying if you can't figure out what the task is (the task part of it times out after a few minutes, letting you see the questions).

It's called Questionaut, and it can be found here.

A summary of the game, including a walkthrough (hidden under spoiler buttons) is here.