This fire and rescue set is part of a series of Nano-Tropolis construction kits that kids can build themselves and then play with. All the model pieces come packed in a hard case that reverses to form a piece of roadway and connect this environment to another Nano-Tropolis systems. A cardboard backdrop with a scene of skyscrapers and trees helps to evoke the urban setting for this particular environment. This set builds a fire station and three emergency response vehicles—a fire engine with a working siren, flashing light, and ladder; an ambulance; and a police car that can be propelled by an included vehicle launcher. The parts are made in the familiar Mega Bloks fashion, which snap together without requiring glue or extra tools. This building system comes with 515 pieces, many of them very small. Although an instruction book with detailed three-dimensional diagrams is included, younger children still may need some help from adults during assembly.