First, load and apply the Mars color setting

Then, go to the Altitude tab of the Lighting and Color dialog, here you can set blue colors for the sea. Just set the sea level and lowest depth color, FT3 will calculate those in between, and you'll probably want to bump up the value for number of colors too.

Use Draw -> Insert file to insert it. This allow you to specify the size as part of the insertion procedure.

Or simply use :CC2SCALE: after inserting it.

Good to know I'm not the only one who take issues with this dark trend. Fortunately most software lets you change, those that don't annoy me.

If you aren't doing it already, remember that relative coordinates are your friend when pasting with regular intervals. Since the next paste is relative to the previous one, one can mass paste by using the exact same relative coordinates multiple times in a row.

Drawing tools select their own sheet by default, so users won't have to manually set the sheet before using a tool (Nor needing to know which sheet to pick).

You can manually change the sheet of any entity using either :CC2MCHANGE: or Move to Sheet (right click :CC2SHEETS:)

If you have the crop image to aspect ratio option on when exporting, you shouldn't get those white bars on the top/bottom.

It gets a bit more interesting when using the dungeon walls, since a regular floor mask would cover up all the unevenness of the stonework. But I am wondering if you could use TRACED to generate a polygon made up from the total area of both the floors and walls here, perhaps with a distance of -0.5 or something like that to make the mask "hole" for the dungeon to give that below ground feeling. Probably need to do something with the path to the entrance too though, to make it look like it is sloping downward towards the entrance.

They are cumulative, you only need to install the latest one.

Looking great. Very nice work there.

The fill in the street in the second one looks a bit repetitive though.

Looks like CC3+ isn't finding your data directory for some reason. There should be a file called @.ini in your installation directory (c:\program files (x86)\ProFantasy\CC3Plus) that contain the path to your data directory. Check that this is correct.

Tools -> Global Raise -> Water Level will rise the water level by the specified amount. Works fine on the mola2x2a Mars data if that is what you are using.