You need to cover the coin with different objects so the falling rocks can’t reach and destroy it. It’s the coin of the famous Caesar. It’s well known that many people try to hurt him and it’s not different this time. A rain of rocks will come and you will have to use your best to hide the coins, so that no rock could hit it. Just use any object you got and place it in the most perfect place. The object and where you place it, it’s the only way to protect the coin, otherwise you will fail.