Each challenge starts with a quick 'just for fun' game. Then there are fact files and infobursts to explore and the challenge itself (play the main game or answer a series of questions). Once you've completed the challenge you can find out about the wider issues facing the planet. Of course, you don't have to work through the sections in order - you can dip into the games and read the information independently too.
The Blue Planet Challenge is just the tip of the iceberg as far as learning about the oceans and the natural world goes. If you've got the bug and want to learn more, check out the following:
Find out how the challenge links to the school curriculum and about ways you might build on your child's interest. There are suggestions about things you can do and see too.
The Blue Planet programmes and the online challenge provide a great resource for Key Stage 1 & 2 Science, for Key Stage 3 & 4 Science, and also for Key Stage 1 - 3 Geography. Check out the links for more information.
Fired up by the challenge? Keen to learn more? Want to start diving, get involved in conservation, or just have a great day out by the sea? We've pulled together lots of ideas and information about how to take things further and each of the challenges ends with detailed suggestions for follow up. If you want to go the distance, try these links.
See our UK-wide guide if you're interested in activities, events or places to visit.
Learn more about the oceans, about diving or sailing or about natural history
If you can't get to the seaside, why not dip into these books instead for some fascinating information about the oceans?
Some of the elements of each challenge require you to have the Macromedia Flash and RealPlayer plug-ins downloaded, so that you can view the animations and video files used on those pages. Please don't be put off by this. When you visit a page that needs a plug-in there will be a link to a site where you can download it for free.
And if you don't want to download plug-ins, or are using a computer where you can't, you can use this site without them. Flash has been used to develop many of the games and activities, but there are simpler alternatives that are just as much fun to use.
You'll need RealPlayer to play the video clips used in the fact files, but if you don't have it you can still read all about the animals and look at the pictures.
For more information on plug-ins, please visit the BBC's Webwise campaign website.
You can download Flash and RealPlayer here, both for free.