Behind the scenes at Club Penguin
It's got millions of members around the world who log on to design and build their own penguin world.
So when heard that two lucky kids were getting the chance to go behind the scenes at Club Penguin, we had to tag along.
Hayley went to Club Penguin's UK headquarters as Jack and Katie got the chance to tell them what they'd change to the website.
They also hit them with a few of their own ideas - watch to find out how they went down with the team!