"Note: this only works on the first three maps of RCT.

After starting anew park find the first guest and name him 'E=Mc1'

Then do this all the way to guest 10. Eg, guest 2 'E=Mc2'

guest 3 'E=Mc3'

And so on.

All the people have to be at least a little happy and not annoyed in any way. Once done all the people should stop and wave to you.

A message will appear instantly, any and then all the rides will be available plus EXTRAS!!!!

This cheat/tip has worked for me around ten times, it may not work on first attempt so try a few times before giving up." - Frankie

"On the main screen of rollercoaster tycoon press and hold Shift then press;r,c,t,e,n,a,b,l,e

A message should come up saying;

RCT ENABLE

Meaning that a cheat menu should be available through the game.

Depending on the version, either one one of the F-- buttons should bring it up. eg F12

This menu allow you to make your own hot keys!" - Wonderman