Instant Money - Press Shift+4 (basically like typing the $), and you'll get an instant $10,000.

Editable scenarios:
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. To change a scenario feature, edit a scn<number>.scn file, where <number> indicates the number of the scenario, located in the "scenario.zip" file.

Change starting money:
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Open the "config.zip" file, then search for the file "economy.cfg". Use a text editor to edit that file and search for the "cash=50000" line. Enter the amount of money you would like to have, than save the file. 

Unlock all animals type in "STEVE SERAFINO
Send in by Tom Wilkins

Name cheats - Rename one of your guests to the following entries to activate the corresponding cheat function.

Exhibit cheats - After the game automatically names an exhibit, rename it to one of the following entries to get the corresponding animal or effect.

Different Animals - Use the following names to rename the animals indicated:

(Hippo) Fat: Two hippos Sumo
(Bear) Deer: Bear gets Free from Exhibit
(Lion) Nan: Get a baby from a male lion
(Unicorn) Larry: get size of a Dinosaur
(Dinosaur) Unicorn: One Horn
(Dodo) Doflopnok: Unlock the White Dodo
(Panda) Blackly: Unlock and turn in to a Red Panda
(Bongo) Bad: Turn in an Okapi
(Okapi) Tall: Get tall as a Giraffe
(Yeti) Bigfoot: Unlock the Bigfoot
(Yeti) Bentley: Turn in to Spyro's friend, Bentley
(Reindeer) Rulpoln: Red light nose
(Reindeer) Dancer: Dances with a female Reindeer
(Croc) Agent 9: Always happy
(Monkey) Agent9: Turn in to Spyro's friend Agent9
(Ape: Chimpanzee or Gorilla) Borneo: Unlock the Orangutan
(Ape) Kangaroo: Unlock the Wallaby
(Gorilla) Mountain: Unlock the Mountain Gorilla
(Tiger) Nope: Unlock the Magnet the Polar bear
(Tiger) Dog: Unlock all Worker Dogs and Great Dane
(Kangaroo) Shelia: Turn in to Spyro's Friend Sheila the Kangaroo
(Penguin) Sgt.Byrd: Turn in to Spyro's frend Sgt.Byrd the flying Penguin
(Sgt. Byrd) Fly: Fly out of Your Exhibit and Your Zoo

Yellow brick road footpath - Place a lion, tiger, and a bear in an exhibit.

Extra money - Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to to edit the "zoo.ini" file. Change the MSMaxCash value to a new amount for your starting money.

All scenarios - Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "zoo.ini" file. Add the following entries under the [scenario] section:

[scenario]
tutorial=0
ba=1
bb=1
bc=1
ca=1
cb=1
cc=1
cd=1
da=1
db=1
dc=1
dd=1
ea=1
eb=1

Cats in the Kettle fast food stand - Name one of zoo keepers Gotfree.

Chinese fast food stand - Name one of the zoo keepers Hotyou.

Crazy fountain - Enter the menu to buy a fountain. Right click on the "Elephant Fountain" and press [Shift] + [Ctrl] + [Alt]. Your fountain will spray water all over your guests.

Set all tour guides salaries to zero - Name one of the tour guides Rosalie.

Dancing cucumbers guests - Name your zoo Green Brine and on May 17 a group of dancing cucumbers with hula skirts will appear.

Jurassic Park - Name a guest Barney. The guest should now be in a Barney the dinosaur costume. Rename the same guest Bad Weekend. Open the Freedom game menu and select the "Jurassic Park" entry.

Darth Vader worker - Name any staff Darker Side. Darth Vader will be on the Hire Staff screen.

Evil Penguins - Put a herbivore with a penguin. After a fight, all penguins will be evil.

Killer bees - Put an insect house in a crocodile's exhibit. A swarm of killer bees will attack your guests.

Animals rampage - Put all the animals in the same exhibit then set them free. They will tear down your trees, trample your paths, and reduce your buildings

Babies - To make a baby animal of any species then build an exhibit. Go to the Adopt an Animal then in between the middle and the bottom you will see three golden symbols. A circle with an arrow pointing southeast, an I, and a circle with a cross pointing down. Click on any species then the circle with the arrow. Put to animals in the exhibit. Then click on the circle with the cross on it. Put two of that species in the exhibit. Then try to make that species really happy and you will get a baby.

Unlock the Triceratops - Name one of your exhibits "Cretaceous Corral." This will unlock the Triceratops.

Unlock the Unicorn - Name one of your exhibits "Xanadu." This will unlock the Unicorn.

New zoo shape - Enter one of the following zoo names to change the shape of your zoo to the corresponding country or region.

Antarctica
Argentina
Australia
Brazil
Canada
China
England
Greece
Iceland
India
Italy
Japan
Mexico
Nepal
Norway
Peru
Russia
Singapore
South Africa
Spain
Tanzania
Turkey
USA

Guide lines on land:  Press [Ctrl] + G.

Set all tour guides salaries to zero:  Name one of the tour guides Rosalie.

Fix all broken fences:  Name a male maintenance worker Bob V.

Remove foliage and $300 tax rebate:  Name a male maintenance worker George W.

Destroy all buildings:  Name male maintenance worker The Rock.

Escaping bear:  Name a bear Deer and it will immediately break out of its exhibit, unless surrounded by an electric fence.

White dodo:  Name a dodo Mr. Dodo to get a white dodo.

Evil penguins:  Put a herbivore with a penguin. After a fight, all penguins will be evil.

Happy penguins:  Get a happiness rating of over 90 for the penguins and they will do a happy dance.

Happy gorillas:  Get a happiness of over 90 for the lowland gorillas and they will do a happy dance.

Killer bees:  Put an insect house in a crocodile's exhibit. A swarm of killer bees will attack your guests.

Animals rampage:  Put all the animals in the same exhibit then set them free. They will tear down your trees, trample your paths, and reduce your buildings to rubble.

Free animal:  Put a male and female of your favorite animal together and they will give birth to a free animal.

Yellow brick road footpath:  Place a lion, tiger, and a bear in an exhibit.

Microsoft plane:  On game date September 15, a biplane with the Microsoft logo will appear.

Sick guests:  On game date January 1, more guests will be sick.

Halloween zoo:  Set your system date to October 31 or November 1 and all guests and buildings will turn orange and black. You can also see buy a jack-o-lantern at the buildings and items menu and see a witch fly overhead.

Santa Claus:  On game date December 25, Santa Claus will fly overhead.

Christmas decorations:  On game date December 25th, you will be able to buy Christmas Trees and Frosty the Snowman for your zoo.

Trio statue:  Win the Super Zoo scenario.

Change pointer hand color:  Press [Ctrl] + C.

Unlimited money:  Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "zoo.ini" file in the game folder. Locate the following lines and change the values after the "=" as indicated. Note: The changes only affect new games and do not work on saved games.

MSStartingCash=10000000
MSCashIncrement=500000
MSMinCash=500000
MSMaxCash=10000000

All scenarios:  Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "zoo.ini" file in the game folder. Add the following entries under the "[scenario]" section.

[scenario]
tutorial=0
ba=1
bb=1
bc=1
ca=1
cb=1
cc=1
cd=1
da=1
db=1
dc=1
dd=1
ea=1
eb=1

Award List:

Type Name Requirement Reward
Silver Plaque Excellence in Exhibit Design Exhibit with 90% Suitability $0
Gold Plaque Excellence in Exhibit Design Exhibit with 99% Suitability $15,000
Silver Certificate Most Popular Zoo 500 guests $0
Gold Certificate Most Popular Zoo 1,000 guests $25,000
Silver Trophy Best Zoo Zoo Rating of 90 $0
Gold Trophy Best Zoo Zoo Rating of 95 $25,000
Blue Ribbon Highest Customer Satisfaction Average Guest Happiness 95 $25,000
Blue Ribbon Quality Animal Care Animal Happiness 98 after 6 months $5,000
Silver Plaque Diverse Species Over 10 different species $0
Gold Plaque Diverse Species Over 30 different species $30,000
Silver Certificate Highest Quality Exhibits 10 or more exhibits with suitability 80+ $0
Gold Certificate Highest Quality Exhibits 25 or more exhibits with suitability 85+ $40,000

Swimming guests:  Build a water tank around a group of guests. The tank will fill up with water and the guests will start to swim.

Crazy guests:  When your guests are looking at an animal from the side of an exhibit, quickly pause game play and build another exhibit around the guests. Place some lions or crocodiles in the exhibit and resume the game. The guests will begin running around screaming.

Free construction:  Pause game play then start building. No money will be taken.

Completing the Breeding Giant Pandas scenario:  To get Panda Research you need to complete the Breeding Giant Pandas scenario. You need to breed Giant Pandas, but you cannot get them until you make fifteen excellent exhibits. You also need to do all Panda Research and get their cave and bamboo. You can then get only two pandas, one male and female. To increase your chance of breeding your pandas, build their exhibit, pause game play, then buy as many pandas as needed before resuming the game. Then wait until the scenario ends.

No rubble or trampled terrain:  Block off part of the exhibit then put terrain that can be trampled there. In their part of the exhibit, put Dirt, Sand, Brown or Gray Stone, or Snow. You can also use water as a fence if the animal cannot swim.

Escaping monkeys:  if the monkeys are put in an exhibit at ground level, sometimes the Chimpanzees will escape from their exhibit. It is is better if you lower the ground about two or three levels then put a wall on top next to the pavement. However, do not put it on the low ground. The monkeys will not be able to reach the fence to jump out. Do not put any trees close to the edges. They could climb the trees. You now will have an inescapable exhibit. This can also be done for other animals.

Developer mode (beta version):  Press [Ctrl] + D for developer mode. This allows you to move entrances, zoo walls, add odd buildings, and vehicles.

Toggle foliage display (beta version):  Press [Ctrl] + F.

Also, when you use this code all your guests will become unhappy, customer satisfaction will drop to zero, and all tank water will become polluted. It is recommended that it be activated at the start of the game.

Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Open the "config.ztd" file with program that uncompresses .zip files, then search for the file "economy.cfg". Use a text editor to edit that file and search for the "cash=50000" line. Enter the amount of money you would like to have, than save the file.

Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "zoo.ini" file. Change the MSMaxCash value to a new amount for your starting money.

Increase recycling profit (beta version):  Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Open the "config.ztd" file with program that uncompresses .zip files, then search for the file "economy.cfg". Use a text editor to edit that file and search for the "cZooDooRecyclingAmount" line. Change the number after that entry to modify the profit of every recycle.

Decrease zoo keeper salaries (beta version):  Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Open the "config.ztd" file with program that uncompresses .zip files, then search for the file "economy.cfg". Use a text editor to edit that file and search for the "cKeeperCost" line. Change the default value of 800 to a lower number.