How you maximise both opportunities is up to you! If the cart topples or runs over the edge, you lose out on the massive 100 points you get for a successful crossing. Another way to win points is the length and height of your bridge.
Once you’ve designed your bridge you can start constructing but remember your overall objective is to get the highest point score possible, so don’t waste points on resources you don’t use. Be careful, you only have one attempt at the answer so make sure you get it right. Some are easy but the harder the problem, the greater the worth in points. You buy these with points earned by solving a series of problems. To make your model bridge you need resources: A4 card, disposable cups, sticky tape and scissors.