This is where the rules are defined. These rules will determine whether or not an entered answer is correct or not. If there are no rules, any answer will be deemed correct. If there is more than one rule, when an answer is submitted, the server will analyze them in order until one of them is broken (of course, if it's a correct answer, it will go through all of them and return a green box). In such an event, any subsequent rules will be ignored. If conditional hints related to these rules are added, only the first broken rule's hint will be shown, even if all rules are broken.