At the beginning of some activities on a Mac with the Safari 12 browser, some activities do not automatically play sound even though the activity will respond to clicks. That can be fixed by a setting in your Safari Preferences to allow Starfall sounds to Auto-Play.

Set Preferences to allow Starfall sounds to Auto-Play:

1. Open www.starfall.com in your browser window.
2. In the upper left of your browser menu bar select: Safari > Preferences. Then click the Websites button in the top bar.
3. Select the Auto-Play option from the menu on the left side to open the list of websites to review.
4. Find “starfall.com” (there may be a long list) and set the option to “Allow All Auto-Play”.
5. Close your Preferences.