Zoo Tycoon DS (DS)

all animals, folige, duilding, etc...
at the main menu screen press (up, up, down, down, left, right, left, right).you should hear a elaphant if done right

Bonus scenarios
There are four bonus scenarios that are unlocked by completing a scenario on different difficulty settings.

Guest Codes
Rename a guest to the name given for the desired effect.

Code - Effect

Andrew Binder - All Animal Houses
Lou Catanzaro - All animal toys
Charlie Peterson - All Foliage
Dr Dolittle - Animals breed more
Mr. Blue - Changes everyone's shirt blue
Mr. Brown - Changes everyone's shirt Brown
Mr. Orange - Changes everyone's shirt Orange
Mr. Pink - Changes everyone's shirt Pink
Mr. White - Changes everyone's shirt white
Mr. Blonde - Changes everyone's shirt yellow
Akiyama - Completes All Scenarios
Bill Gates - Donates a lot of money
Adam Levesque - Get all Animal Shelters
Zeta Psi Make - Some Guests sick
Steve Serafino - Unlock Endangered animals
John Wheeler - Unlocks All Animal Shelters Available

Unlock All
To unlock all items the next time you start a game, press these buttons at the main menu. if entered correctly, an elephant sound will occur: Press UP, UP, DOWN, DOWN, LEFT, RIGHT, LEFT, RIGHT, UP, UP, DOWN , DOWN, LEFT, RIGHT, LEFT, RIGHT. All animals, foliage, buildings, etc.. will be unlocked once you start the next game.