I was wondering if anyone out there has purchased this device and can tell me a bit about it. I found a game that requires the Fusion Fly Pen and have read about it but it is very confusing to me. You get a disc to install on your home computer, but all the stuff on the game, and on the Flyworld site says it's self contained. Do I need the computer to use the Pen? I guess I am just maybe reading too much into this, but before I spend money for something like this, I would like to know if it really works like they claim. If anyone has one (It's made by Leap Frog so I assume it's mainly for kids) please let me know how you like it, how it works, etc. Since I am a kid at heart, and the game is Harry Potter in nature, I got the game but I don't know if I want to get the Pen. The Mauraders Map that comes with the game is pretty cool, so I could use it for display if you say the pen is not worth it.