I think the most crazy part is the topside part, where there's literally always one room full of aliens (10+), and practically all of them are carrying DPLs. That's kind of fun, once you have MC abilities, strong enough to MC one or two inside that, as you will wipe out most of them in an instant. On the other hand, if not, it's damn annoying. The only thing, that helps, is the aliens not using their DPL right from the very first time they spot you. And yes, the most »fun« part under ground is the search for that last (few) alien(s), when you try to clean the place up for item collection. Most of the time, it's actually more reasonable, to just destroy the Synonium device, than to hope for wiping out all of them. As at the end of the day, with usual luck, it's a Tentaculat, or more, that's running around... As for the T'leth levels: They are always the same layout. So if you had a good look at it, the first time, at least you know exactly, where to run to. But still, they are a pain in the butt for their sheer size and of course, this stupid only-one-big-tunnel-like-way-to-the-target layout. At least they are not half as crowded, as this one alien filled room at colonies. =) (Which is funny, considering, that you are in the heart of the enemies place...)