TumbleBooks are created in flash animation. If you are having trouble entering the site or viewing any of the books or quizzes, make sure you have downloaded the Flash 6 plug-in. You can download it for free here. It only takes a few seconds and you will then be able to view the great animation and hear the engaging narration.

The minimum system requirements are:

- MAC/Windows 98/Me/2000/NT/XP
- Microsoft Internet Explorer 5 / Netscape 4.x or later
- Flash 6 plug-in
- Video display card (minimum resolution 800x600)
- Sound card

Find more information here.