RollerCoaster Tycoon 3

RollerCoaster Tycoon 3 cheat codes: 
Rename one of your park guests to get one of the following effects:
ATITech      - All guests and staff in the park move faster than normal
Atari        - All guests laugh
Make Me Sick - All guests throw up and nausea is reduced to zero
Frontier     - All rides & coasters never break down as long as cheat is active
Chris Sawyer - Guests jump and cheer
Jon Roach    - Guests will ride all non-coasters before leaving the park
Sam Denney   - Guests will ride all roller coasters before leaving the park
Melanie Warn - Guests' happiness increases
John Wardley - You can build coasters and rides with no height restrictions
David Braben - You can build coasters&rides with unl. launch & chain-lift speed
M Brookes    - You can place walls and scenery items on path edges.
James Hunt   - You can ride a dune buggy across the park.
When you're done, exit and delete the buggy as scenery.
FPS          - You can see the FPS rate (frames per second).
Jonny Watts  - You can use PeepCam (view what your guest would see).
Guido Fawkes - You can use the Advanced Fireworks Editor.
D Lean       - You can use the Flying Camera Routes editor.
Andrew Gillett     - Friction on all roller coasters is reduced.
this can help coasters from RCT1 or RCT2 run correctly.
Rick Griffiths     - The insides of all tunnels (sides, ceiling, and floor)
change from rubble to sharks.
Alistair Lindsay   - The speed of all sound effects are changed when pausing
the game and using fast and fastest speeds.
John D Rockefeller - You get $10,000.
Isambard Kingdom Brunel - All of your staff become fully trained for $1,000.