Bottom Line: I have to be honest, sometimes I have to hem and haw over the pros and cons of an app before writing the bottom line for a review, but this might be the best Dr. Panda app published. The interface is simple and easy to navigate while figuring out what combinations of buildings make larger buildings is like a giant Easter egg hunt. They have thought of everything from ease of play, to turning off the promotions screen, to opening the buildings to interior play and even a night mode. I had a blast tinkering with this app and I'm betting that you and your children will too.