Gameplay in response to zfttm64s question:
Technically you can open the levels in any order as long as you have enough jiggy's but I think Rusty Bucket Bay is next or it could be Freezeeazy Peak.

That's one thing I liked, If you get bored with one level you can do some jiggy hunting in another.
In the beginning you meet Bottles The Mole who gives you the option to train with him or go to Grunty's lair on your own. If you choose to do option B you can't ask him for help until the first level or he comes close to erasing your gamepak. (Yes, He actually says that when you pester him too much.)

The moves seem simple but are unique at the same time. You have the jump (banjo goes weeeee!) and your bear claw punch by standing still and pressing B. if you press A and B at the same time you can do a 'Kazooie Peck Attack' move. Where Kazooie will bite the enemy on the eyes or head. (peck peck peck) You can also do a 'Bear Charge' if you crouch with Z and press B and the talon trot somewhere in the first level makes it easier to move around.

Then you have your 'birdy backflip' by holiding Z and pressing A to get you to higher spaces.

You can get it the Talon Trot here if you do not want to hunt.

Spoiler (Highlight to read):

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http://banjokazooie.wikia.com/wiki/Image:Mumbos_Mountain4.png

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See this proves you can have flexibility in an adventure game without it being GTA style. in response to any sickos who think otherwise since Zelda fans think you have to be liner or it would turn into a Grand Theft Zelda.