Cheat Codes
Rollercoaster Tycoon 
Rename any of your park guests to one of the following names to activate cheat function:
Chris Sawyer - Takes Pictures of Rides
Simon Foster - Paints Pictures of Rides
Melanie Warn - Increase Guests Happiness
Katie Brayshaw - Waving Guests 
 Damon Hill - He\She drives faster in the go-carts. 
John Bibrough - Each time you press the L button, the park rating goes up. 
Tony Day - He\She gets hungry all the time and will buy alot of burgers. 
John Wardley - He\She will think "Wow" all the time. 
John Mace - He\She will pay double for all the rides they go on. 
         Free money: Go to the Finances by pressing "F", then press ENTER + "M" for $5,000. This can only be done once a month for unlimited amount of cash??? 
 All scenarios, rides and infinite money: At the Main Menu, hold SHIFT, type "rct2" and press ENTER. If done correctly, you will hear clapping??? 
 
 ??? Not for all versions
 

 RCT CHEATS/STRATEGIES

Note:  later versions or patches may make some of these obsolete.  It's just nice to know what you could once do!  Strategoes always work.  Check out the Strategy section.
Under a popular rides window, goto the money tab... when the ride is in progress, lover the price dramatically, when the vehicle arrives, jack up the price a ton! if you were quick, you can get about $10-$15 per person ***repeat process***. the only downfall is if somebody cant afford it they walk away (not that bad)
there's a rumor that if you start a park on leafy lake, open the park with no rides or changes, charge $7.00 admission and save the game as reywassirhc(Chris Sawyer Backwards) that you get unlimited money and every attraction. I don't know if it works but it's worth a try.
Click pause and reset a ride. It will make the rides come back to the station but not make anyone leave the lines. It makes you LOTS of money.
If you name a guest Michael Schumacher then he will also drive very fast on go-karts.  
John Bibrough - Each time you press the L button, the park rating goes up??
First u make an "intersection" at the entrance/exit of the park. Then u put a banner right infront of the doorway( the words have to be facing into the park). Then u click on the red icon w/ the line through it. The guests will have to stay in the park and more will keep coming in!
note- This will drop your park raiting down so use it carefully!
i hope this helps u out!

Cheats from Adrenaline Vault

Some of these cheats only work on certain versions - check them out
Hire Einstein To extend your research by leaps and bounds, find Guest #1 and rename him “E=MC2”. Then find guest #2 and rename him “E=MC3”. The two will meet and begin brainstorming. Shortly thereafter they will ask to be hired on as the park’s research developers. Say “yes” and pour your resources into the think tank. The following year, research and development will have grown by leaps and bounds. You will have all of the latest rides and nearly a billion dollars to spend!??
Receive A One Million Dollar Gift To get lots of money for your park, close it down for one full year! Afterwards, a man dressed in a blue suit and holding a clipboard will give you a little “helpful money” ($1,000,000). Somewhere else it's $10,000. This is fairly silly because it adds nothing to park value or rating, and that, with people, are the main objects of beating the scenarios, and you can borrow money to finish up a project.,
Retain Ride Popularity To retain a scary ride’s popularity, simply delete a segment of track and replace it with the same thing. The guests will be fooled into thinking that the amusement has been improved and will continue flocking to it! (Note: Better yet, actually improve it.  The rebuilding only a portion does not seem to work.  This is also good to do when your ride breaks down, and you want to add a bigger station.  Only improving it or replacing it works in the later versions (with patch)..
Kill Everything First, find guest 2374, rename him as "Timothy Mcveigh". Next, make him walk by an entertainer, drown him, find a slide, and watch for a big bomb to go down the slide. Then, all your rides will be deleted, all people gone, all land flattened, and you'll receive ten million dollars. This is really SICK! The odds of it working are zero to none.
Increase Park Rating Though it is questionable ethically, it makes business sense. Maintain high park ratings by drowning all unhappy guests! (Click on a mad guest and use the pincer icon to place him in the water.) This is really SICK! The odds of it working are zero to none, since you'd be depleting your guests, and that is contrary to your objective.  Just hook them and put them at the gate, especially the lost ones, they're the most disgruntled.
Maximizing Productivity of Shops and Stalls Location is the key to maximizing profits! Here are a few business tips: Don’t squeeze stores together. They will compete for customers and their prices will fall. Put shops and stalls near the rear of the park, NOT at the entrance. Once tired and hungry guests have walked all the way to the back, they will be more than willing to pay higher prices for snacks.
Remove Weeds without Mowing To remove weeds without mowing the landscape, click on a construction button (like the leveling land button). Then click on a weed it will disappear!
Utopia at Mega Park To unlock Mega Park, a scenario with a sprawling plot of land and no objectives, you must complete all other scenarios.
All Facilities To stuff your park with all the enmities, push [Shift] + Z.
All Rides To put all of the rides in your amusement park, push [Alt] + Z.
All Shops To put all of the shops in your amusement park, push [Ctrl] + Z

ADDED ATTRACTIONS CHEATS

Hacking the RCT:CS exe (rct.exe) with the program found at: http://publish.uwo.ca/~jdrexler/rctpatch/  will remove the maximum number of rides and those nasty money cheat checks. Next, you need the only available money train for RCT:AA (Has no viruses, you might want to double check though) and run that before loading the game. I have been playing with this trainer before the exe hack and it didn't work, but now it does, so you can now have unlimited money as well as save the game.
Hope this helps at all.
 
 
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