"The Lego Hidden Side Mystery Castle was so much fun to build. My daughter spent the whole day off and on building the castle. The instructions are detailed and the pieces are split up into separate packaging to make it easier to organize and build. This was a great indoor activity to keep kids busy and at the same time learning about how structures work. As I've come to expect from Lego, the pieces all fit perfectly and there were some extras of the smaller pieces just in case they got misplaced. Building it was not too challenging especially for a teen, but may be a little more challenging for kids under 10. However, that being said, it's a great activity that teaches a lot about building in general.
Another thing I liked was the details in the set. From the miniature piano to the "stained glass" windows and moving parts within the set, there were so many details that made this set worth every penny. My absolute favorite part about the castle though was the innovative technology that was built in. I love that there was an app to download after you build the set and you can actually play games and "catch ghosts" virtually. So not only does it give kids something to do while they build, but becomes a long term activity as well. What's also great is that this isn't just limited to kids; it's a great model to build for anyone and looks great as a show piece in the home as well. I am so very impressed with the Mystery Castle and highly recommend it to anyone looking for an activity that is fun, innovative and imaginative."