The instruction booklet mentions "a hidden
suprise" and here it is:-
After you've collected 20 or more crowns on each level the surprise will
be accessed.
It will be on the menu where you select the level you want to go.
There should be small box that is the level. It is called "....?"
(they like to keep everything a secret, don't they?).
When you select the level you will go to a room where you can fight each
of the bosses from the six levels.
You can see a symbol above the doorways to the bosses that represent
one of the six levels (ex. chocolate kid- Kid's Land).
So now you don't have to go through the level to fight the boss you just
go here.