Is there a way to make bigger maps?

Take the contour file.

Open it in paint.

Make it bigger.

Save it.

Then, in the .ini file for it, set it's size coordinates to it's new dimensions.

Hmm, ive been playing around with the folder structure and .ini files and painted a wider scene for a wider map but i cant seem to get a hold of it and understanding how everything works. Also i cannot change any new size coordinates in the .ini file for the custom scene.

it says i can make maps in base.rte , promgrounds.rte and all kinds of different .rte´s what does this mean? can i make my own .rte and put in my own .bmp (custom size map) and open it up in editor to place out stuff and save it as a custom sized map with base built in it?

Could i kindly ask for a wery detailed tutorial for this, once i understand how it works i would jump on to make some wery cool maps.

Just mess around with this until you understand scenes a bit better.
The different colors in the .bmp are different types of dirt.

(Extract and put the .rte folder in the Cortex Command folder.)

Excellent! Templates is always a big help to fiddle with and getting to know how it works, ive managed to make a custom size map, and adding mod-stuff to the editor making them deployable.

I didnt get the backdrop/background to work with custom size map though. Any tips with that?

I have colored the ground as i want it, and then i colored the empty space to that pink color, but the map gets totaly solid ground anyways, how do i make empty air space in my map?