Make the unlocking of new items more intuitive

The hidden items are too hidden.
It is not likely that player will be able to find all the hidden items.
Perhaps making the fairy godmother help somehow. She could show her face on the screen and wave her wand so that some little sparkles would fall from the sky when the princess crosses somewhere where there is a hidden item.
The player would there is something, but not how to get it. It would be easier to gess this way.