To use the Hot Wheels City T - Rex Chomp Down Playset, first place the included Hot Wheels car in the police station. Then, hit the slam launcher hard to send the car through the 9 - inch loop towards the defeat zone. Try to time the launch just right to knock out the T - Rex. When the dinosaur falls, you'll see its eyes change from angry to X - es. This set can be connected to other Hot Wheels sets to build a bigger city, but remember additional sets are sold separately. As for care, keep the set away from rough play that could break the launcher or the loop. If it gets dirty, you can use a soft, dry cloth to clean it. Have fun playing and saving Hot Wheels City!