I've been working on this for days and all I'm doing is going round and round in circles and revealing more and more unknown verbs. My main thoughts were oriented around putting the coin in the car before stashing the treasure, giving it to Mandy, hiding it somehow (but there's nothing to hide it in), disguising it or somehow teleporting it during the process of making a wish. There is no way that I can earn more than 90 points without the coin or 99 points with the coin.