From the campaign:
You want Castle! for your gaming table. Your minis want it. It looks amazing right out of the box. It even feels amazing. It is modular and infinitely interchangeable. It stacks. Even better, it unstacks. You can easily remove the various floors of your Castle! and put them back on as you move up and down during gameplay. You can build an awesome Wizard’s tower as tall as yourself and game all the way up. Then you can break it down, box it up, take it to a friend’s house and build something completely different, but just as awesome. Then do it again.