How to use: Connect the sets together to build your own Hot Wheels City. Place the included Hot Wheels car on the track and start the push - around play. Create different stories as you go. Attention: Keep small parts away from children under 3 years old as they may pose a choking hazard. Maintenance: Wipe the playset with a dry cloth to keep it clean. If there are stubborn stains, you can use a mild soapy water and then dry it thoroughly. Store the playset in a dry place to prevent damage.