EDIT: Updated to remove misleading messages which made it seem like I was not the seller. My sincerest apologies.
I am the seller. Trying to figure out a fair price and also help someone out who is missing this puzzle from their collection.
I bought it on 6/10/2011 from Thinkgeek for $89.99. I (literally) very gently played with it for maybe 20 minutes and then put in the box and on the shelf. It's been there ever since. It has never been solved. I just kept thinking "I'll get back around to it one day", but never did.
Link: http://www.amazon.com/Sonic-Games-Kuku- ... op?ie=UTF8
Thanks