How do you pass level 42 of bridgecraft?

Here is the pic http://i113.photobucket.com/albums/n236/AaronzDad/BridgeCraft/bc4.jpg

you click the 42nd 42 and level 42 will be completed and you can then move onto level 43

8 Grade to 10 Grade or Secondary school level

This answer relates to the new and third version of "This is the only level 3". First, you have to click on the "menu" button. (don't worry, your level get's saved and you can continue on any time...

go on a different tab and do something on it for a while.. the gate thing will automatically go down for you.