This is the ultimate vehicle! You can make 3 or 4 different kits or 1 super vehicle. Includes enough stuff to make the Mousetrap, Egg Drop, Air Prop or Jet Balloon Racer. The Walnut Ridge Problem Solving Kits continue to be one of the most popular kits for kids available. Use them for science projects, scouting/4H events, class projects or just plain parent and child fun! Each kit contains all the items you'll need to make the vehicle, plus one set of instructions...but try to make it on your own first! Use the instructions only if you get stuck! If it works...then you succeeded!