To open the cheat box press [Ctrl] + [Alt] + [Shift] + C. In this box you can type in your cheats!
Open the cheat box and type in 'garbage in, garbage out'. You will be able to place any garbage building now.
Open the cheat box and type in 'i love red tape'. You will now be able to enact any ordinance.
Open the cheat box and type in 'salt off' or 'salt on'. All the water in the map will now be fresh or salt, whichever you chose.
Open the cheat box and type in 'water in the desert'. You can now place any water building.
Open the cheat box and type in 'the birds'. Some birds will fly around the city.
Open the cheat box and type in 'simon says [string]'. Instead of typing [string], type what you want to appear in the news ticker. Whatever you type in will appear in the news ticker.
Open the cheat box and type in 'power to the masses'. You should be able to place any power plant now.
Open the cheat box and type in 'UFO swarm'. Then click on UFO in the disaster menu. UFOs will come and destroy your city.
Open the cheat box and type in 'nerdz rool'. All your industries will be converted into high tech, non-polluting industries.
Open the cheat box and type in 'stop forcing advice'. Your advisors will now stop giving you annoying advice.
Open and close the Power Plants menu, the Rewards & Opportunities menu, and the Garbage Disposal menu in that order. Now open the Landmarks menu, and all of the Simcity 3000 buildings will be available.
Open the cheat box and type in 'call cousin vinnie'. He will offer you $250,000. (I'd take it!)
Use the above cheat (Petitioner offers $250,000) and refuse his offer. Now open the cheat box and type in 'zyxwvu'. You can now place the Castle in your city.
Open the cheat box and type in any of the following codes to trigger a message: 'porntipsguzzardo, bat, broccoli, sim, llama, help, scurk, erts, money, electronic arts, sc3k, Broccoli Education Foundation, will wright, ticker, simcity, 1234, maxis, moremoney, hello, mayor, fund, easter egg, simant, simmars, simcopter, simearth'
Open the cheat box and type in any one of the following codes: 'terrain one down, terrain ten down, terrain one up, terrain ten up'. I think you get what these do.