Do not bother to download a NOCD crack. 
It makes changes in the game so that you won't be able to patch it anymore. 
I know, another LL patch is probably never going to be released but anyway. 
NOCD cracks are basically screwing your game.

There's a way how to let LL run without the CD and without a crack and it's all thanks to 
Adix who found out about all this and told me. I love you Adix.
(Important: If you do not own LL legally then you're not allowed to do this)

Let's get going.
First of all, you'll need quite a fair amount of space left on the hard disk to which you installed 
Rollercoaster Tycoon. It's approximately 250 MBs.
If you have that, go to your Rollercoaster Tycoon folder and create a new folder called "CD". 
Open it. You should be in ...Rollercoaster Tycoon\CD now. Create another new folder called "Data" in there. 
You end up with ...Rollercoaster Tycoon\CD\Data.

Put your LL CD in and open it. Do not run the autorun. If it comes up automatically just close. 
Right-click your LL CD and select "open". It should open a new window with the contents of the CD. 
You'll find a folder called "Data". Open it. Now highlight the following files:

csg1.1
csg1i.dat
csg2.dat
csg3.dat
csg4.dat
csg5.dat
csg6.dat
csg7.dat
csg8.dat
css17.dat
css2.1
mp.dat
tutc2.dat
tutk2.dat
tutl2.dat

When all of these are highlighted, press CTRL + C.
Then open your Rollercoaster Tycoon\CD\Data folder and press CTRL + V. It should then copy the files.
After it's done you can go on to the more complicated part.

Click "Start" (yes, bottom left of the screen) and then "run". Now open up the registry editor by typing in 
"regedit". Then press enter of course. The registry editor appears. Now, listen, you've got to be careful with 
this thing! If you edit the wrong things you can literally screw your whole computer.
So don't do anything else except for the following because all that could happen is your LL to be screwed 

Anyway.
To the left of the editor, you should see "HKEY_CLASSES_ROOT" or "HKEY_CURRENT_USER", etc. etc.
Browse to the following: 

"HKEY_LOCAL_MACHINE" --> "Software" --> "Fish Technology Group" --> "RollerCoaster Tycoon Setup".

Now on the right you will find several entries of which only two must interest you. 
Those are "Path" and "SetupPath". Doubleclick "Path". It comes up with your Rollercoaster Tycoon path. 
Highlight it and press CTRL + C again. Now close this dialog and open "SetupPath", again by 
doubleclicking. Highlight whatever there's written in and press CTRL + V. To the pasted you add "\CD". 
So in my case this is: "d:\Spiele\RollerCoaster Tycoon\CD". Of course without the " ".
Notice! Whatever you do in the registry editor, upper and lower case DOES matter.
When you've done all of the above you can close the registry editor and you're done.
Take the LL CD out and try launching the game.
I'm not sure whether you'll have to restart or not but I doubt it.

If you screwed your LL then I'm not responsible for it. Of course I'll help you to fix it again. It's easy to do. 
Don't worry.


Happy NO CD LL-ing.

P.S.: To those who are new to this registry editing stuff. It allows you to make changes to your windows 
you've never even dreamt of. I probably couldn't enjoy XP without the thousands of tweaks and fixes I 
underwent it to. There are loads of sites who'll be teaching you how to get into registry editing. 
Still keep in mind that it's a dangerous thing to do.

P.P.S.: A similar way must exist to get RCT2 to run without the CD. Although Adix has been trying 
hard to find out he still couldn't manage. If someone knows a way then please let us hear it.

==============================================================================
Update - 11th. December, 2003
--> Thanks to Mortician, we have found out about a problem concerning this.
If you didn't choose "max" when installing either RCT or LL then it won't work properly.