1. Gather all materials. You will need a mousetrap, 2-4 wheels, axles to connect wheels to mousetrap, small metal loops for axles, and string.
2. Attach metal loops to bottom of mousetrap.
3. Put wheels onto one side of the axles, slide through small loops, and connect the other wheels in once the axle is through the loops.
4. Tie the string onto the end of lever on mousetrap. ( Can make this part longer by adding onto the lever arm, which should allow the mousetrap to travel farther )
5. Tie the other end of the string to one of the axles. This will allow the car to move.
Now that the mousetrap car is assembled you can use it as you please. However it is still a trap meant to do harm so be cautioned during the assembly of your mousetrap.