Zoo Tycoon Cheats
Unlock all things
At the main menu, press up up down down left right left right up up down down left right left right and it will unlock everything including the 5 mystery animals. Must start a new zoo after entering cheat. If you enter the code correctly you will hear the sound of an elephant.
Code: Up, Up, Down, Down, Left, Right, Left, Right, Up, Up, Down, Down, Left, Right, Left, RIght.
There are four bonus scenarios that are unlocked by completing a scenario on different difficulty settings (beginner, advanced, etc.).