The challenge was to make a Lego car that could run by a balloon. It took me two days because I couldn't get it to work. Mommy got it to work twice but then it wouldn't work again. I took off a few pieces to see if it made it lighter so it could move but it just ended up making the car break easier. Then the next day my dad helped me so it worked and my car could run by balloon if I blew up the balloon, making a little thing to attach the balloon onto, then put the balloon down and give the car a little push and it worked!
The balloon was the force that made the car move and with just a little help, it can go faster.
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