 Stealth Activities, in Moodle 3.3 Earlier versions of Moodle had a quirk that allowed activities to be hidden inside extra weeks or topics, but still be accessible to students. These were known as orphaned activities. Some advanced Moodle users exploited this quirk as a way to achieve particular designs for their courses. Now in Moodle 3.3, you can put any activity into stealth mode to achieve this same effect in a more officially supported way. Let's take a look at an example and see how it works. In this exam preparation course, there are several revision quizzes. It would look neater if they could be listed in a single page, such as this one. But if we hide the quizzes, they won't be available when students click them in this page. A new site-wide setting enables admins to choose whether to allow activities to be available, but not shown in visible sections of the course page. If the admin enables this setting, then the teacher can simply choose any item, click to hide it, and then click again to make it available, but not shown on the course page. First, our teacher hides the quiz. Notice the blue message reminding teachers this item is hidden. He can then choose to make the quiz available but not shown on the page by selecting this option from the Action menu. Notice again the useful reminder to teachers. He does this for the other quizzes too, and then all he needs to do now is add the links to the quizzes in the single page. Or, as our teacher has done, if he uses the quiz names, then the activity auto-linking filter will do his work for him. Note that if the administrator doesn't enable this new stealth setting in advanced features, teachers can still make activities available but not shown, but first they must hide the whole topic. When our student enters the course, she doesn't see the list of quizzes. She does see the single page, and when she clicks on it, she can easily access the revision quizzes to do them, and she'll be able to see the results in the grade book. To summarise, teachers can put activities into stealth mode, so they're not shown on the course page, but remain usable by students.