In the jungle land whenyou come to the log with a crown inside, go back to the begining of the log. jump on top of it and jump to the heart on the stump. then jump ann the tree by the stump walk up it and you will find a crown.
Collect 20 crowns on each level and go no to the level select screen and there will be a box with a question mark on it.Select this and you will be able to fight all the big bosses without going through the level each time.
In the jungle level,go to the place where you have to jump to get to the cave. next to it, you should see (if you are Fred) a ledge. Follow the ledge and you should reach the cave.