Check out this concept art for environments and tracks in Angry Birds Go!

During the development of a game, lots of concept art will be made that demonstrates how the company making it wants it to look and feel when it's finished.
Usually this art is hidden away, never to be seen by people outside that company, but Rovio has just sent us some awesome behind-the-scenes images to show you.
Take a look below at how the game's environments and tracks started out in life.

Air track 1 mid-section

Air track 1 start

Air track finish line

'Bird' Mountain

Rocky Road Cave Entrance

Rocky Road cave start

Seedway

Seedway landscape

Stunt waterfall track section
How well do you think the developer stuck to its original concepts? Spotted any big differences between these bits of art and the finished game?