This one's a good one, it's my favourite map I've released so far. You hop between meatspace and cyberspace, leaping from one end of a desert facility to the other and frag plenty of monsters on the way. Facilities made up of sparse buildings, desert/wasteland environments and cyberspace are three of my favourite map settings, so I guess it makes sense that a map with all three would turn out well. Give it a try, it's Map23!
DOWNLOAD IT HERE