if you have any problems getting the games to run you might need the latest version of direct x

The Principality of Mars part1

http://www.megaupload.com/?d=44skm9xb

The Principality of Mars part 2

http://www.megaupload.com/?d=x5haxsu0

The Principality of Mars Part 3

levels 1 to 4 http://www.megaupload.com/?d=4NTPM3IP
levels 5 to 7 http://www.megaupload.com/?d=9WQ3XEV4
levels 8 and 9 http://www.megaupload.com/?d=F6KEPGOQ

Direct x update

http://www.softwarepatch.com/windows/directx.html