The Wonderland Board

I have been absolutely EVERYWHERE but can't find this one.
Also, I have completed all found levels, but on wondering round, I can see more levels to do, but can't get to them, eg, on the sand dunes.
I presume I must do these, as I still cannot get access into the temple as I need a blue key and also a rainbow key.
I have just hit a dead end here and can't see what to do next.

A dead end? That's it!

Go a bit further in that dead end and wait a while, the star is raising up, in case you've the glowing gem you see much better the star is raising up
you still the glowing gem to play this level!!!

Sorry, but which dead end do you mean?

Tessa:

Do you remember the first set of stone gates, there were 3 of them?
On that same screen, south of there, there is a dead end. Walk down it all the way to the end. If you've got the right path, you'll get a message and a star will pop up.