PCCheats
Sim City 3000 Unlimited

Walkthroughs and Guides
Outside link to all the information you'll need on this game, and more!
Courtesy of: Gamefaqs.com

PASSWORD CHEATS

HOW TO ENTER THE PASSWORDS
1. While in the simulator, press:
Ctrl + Alt + Shift + C.
A prompt box with a flashing cursor will appear in the top left corner of the screen. 
3. Type one of the passwords below. 
4. Press Enter to activate the cheat.

Effect .... Code
$250,000 donation offer from Vinnie .... call cousin vinnie
All items are free .... i am weak
Change the sea to fresh water .... salt off
Change the sea to salt water .... salt on
Construction costs set to $0 .... i am weak
Create flock of seagulls .... the birds
Load grayscale picture as terrain .... load terrain
Lowers the terrain by one .... terrain one down
Lowers the terrain by ten .... terrain ten down
Raises the terrain by one .... terrain one up
Raises the terrain by ten .... terrain ten up
Set "Disaster" to "UFO" for unlimited UFOs .... ufo swarm
SimCastle construction, if Vinnie's offer was activated and then declined .... zyxwvu
"Sorry, Money Doesn't Grow On Broccoli" message .... broccoli
"Aha! We Have A Real Pro Here! Try BROCCOLI" message .... porntipsguzzardo
"Da Da Da Da Da Da Da Da Da BAT-man!" message .... bat
"If You Build It, They Will Come" message .... scurk
"The Llama Is A Quadruped" message .... llama
"Duo Ragazzi's Easter Egg Palace: Old World Charm In A Post Modern Setting" message .... easter egg
"If You Lived Here, You'd Be A Sim" message .... sim
"Dozens Of Hidden News Ticker Reveals; Sims Encouraged To Collect Them All And Amaze Friends" message .... help
"What Will He Think Of Next?" message .... will wright
"Investment Tip: Buy Low, Sell High" message .... erts
"Not Just Sports Games Anymore" message .... electronic arts
"<city name> Picayune: The Finest In Scrolling Entertainment" message .... ticker
"Money Does NOT Grow On Trees, Study Concludes" message .... money
"Keep Trying And Maybe You'll Figure It Out" message .... simcity
"Unknown" message .... simon says
"Greetings Mayor, Your Sims Salute You" message .... hello
"Mayor <mayor name> brings <city name> To News Ticker Highlight" message .... mayor
"Mayor Suspected Of Attempting Embezzlement; Ends In Failure" message .... sc3k
"Secret Number Combination Causes Announcement In News Ticker" message .... 1234
"Did you know that MAXIS spelled backwards is SIX AM?" message .... maxis
"MOREMONEY Not Cheat Code, Research Concludes" message .... moremoney
"Mayor Under Investigation For Possible Embezzlement" message .... advisor
"FUND Not A Cheat Code, Do Not Type MOREMONEY, It Is Not A Cheat Code Either" message .... fund
All extra rewards .... pay tribute to your king
All power plants .... power to the masses
All water plants .... water in the desert
Description of City Hall set to "Miles and Miles of Red Tape"; date set to the year 1900 ....i love red tape
High tech industries .... nerdz rool
Recycling plant, waste to energy incinerator and normal incinerator .... garbage in, garbage out
Stops advice .... stop forcing advice
Mortimer will say the indicated phrase. .... force mortimer to say <phrase>
Moe will say the indicated phrase. .... force moe to say <phrase>
Constance will say the indicated phrase. .... force constance to say <phrase>
Marla will say the indicated phrase. .... force maria to say <phrase>
Randall will say the indicated phrase. .... force randall to say <phrase>
Gus will say the indicated phrase. .... force gus to say <phrase>
Karen will say the indicated phrase. .... force karen to say <phrase>
The petitioners will say the indicated phrase. .... force petitioners to say <phrase>
If you have connections to your neighbors, they will start trying to make deals .... let's make a deal