A four-story house, with a yard. Overall, this is quite impressive. The attic is great, and the sniper positions outside are pretty cool. The interior (first and second floors) are a bit cramped... but what would you expect, running around a house with weapons of destruction? Check under the stairs in the basement for a Bungie-esque joke.

Twelve levels. These tend to be huge, open areas, with smaller side areas. Texture choices are odd, in some cases (and overabundant in most). The levels seem to get better as you go higher in the map set (although I encountered a freezing bug in the last level). A couple are extremely high in alien count.

A pretty interesting level, with lots of secret (or semisecret) doors. Flow is great, once you've figured out where these doors are... and there's a little something for everyone. Open spaces, tight corridors, hideaways... there's always a way out of wherever you are. Watch the double jugs (non-trivial to trigger, so you may not see them).

An abandoned church, with a few elevators, some teleporters, and a secret passage or two. Always keep in mind-if you can see them, they can probably see you... Update adds lots of secret passageways, reworks some of the existing ones, and generally cleans up. (A much sneakier level, now...)

A pretty cool small level designed for two players. You face each other across a lava moat. Both have a large wall to hide behind, but your opponent can raise yours with a well-placed projectile, leaving you defenseless... and for those who believe the best defense is a good offense, you can build a bridge across the moat (although it's not necessary-you can simply run across, using the alcoves on the side).

A simple arena in two flavors... one has a walkway around the outside of a lava pool, the other is the same with a hill poly in the center. Weapons are really tight (looks like they're set up for two-player games... which is okay, I guess, since more than three (or maybe four) would be insane.

Two levels. One is a conversion of Bob World HQ (no credit to Mark Conahan, the original creator), using the alien textureset, and the other is a small insanely busy arena with a raised cross in the center.

6 maps, and a physics model. A pretty good spread-a bungie tribute, a few KOH maps, a novelty level, and a couple of flavors of a nice paintball-style arena. Fast-paced, generally...

The main room is a bunch of walkways between raised areas. There are overlooks that give you a birds-eye view of the arena (this was the author's original impetus), and lots of back passageways for hiding in/getting to sniper positions. More ammo than you'll ever need.