I have defeated all the pears in the last learning level but i have not advanced to a new level.
As all you guys say, I don't think you can. There are no voids, right?
I tried placing a bomb on the rope, on the bucket (this works in the adventure version, it advances you to lvl10, but not in this version), and behind the wall next to the well, and in the well, but nothing works.
For hardband and those in general who can't get past the level where if you don't act quick enough you get stuck, I recommend to not bother. After all, you just have one major level left plus a connecting one, so why bother? Nothing extraordinary happens after you beat the last learning level anyway.
P.S. Did you know that if you collect the letters of "Cristal" in order, you get a bonus added to your score?
But since your score isn't counted in the learning version it doesn't matter.