You start inside a cell and break out with the help of a giant boulder. From there, you search for the key that will enable you to explode giant metal bars and escape. It's an entertaining map, with some use of Armagons features. A couple of Gremlins, rotating brushes, lighting effects.
start.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/WRae4phFZ-Q
Decent map. Good use of explosions and breakable walls, both for progression and secrets.
The battle with Armagon is not thought out, at all. You can just stand still and shoot away, with no threat whatsoever.
Has a secret map exit.
k2m1.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/PWjwLTnlAo8
I like the beat element trials to unlock the path forward trope. I do have to mention that I'm not a particular fan of the water current gameplay. There's no visual indication of a safe path, so you have to just wing it. In the earth room, the movable boulder was a nice touch.
Aztec themed, pretty nice, visually. Good map.
korn.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/VdhHxjw1LaI
Enjoyable map. Gameplay has variety, it looks pretty decent. The final puzzle isn't really a puzzle, but it's appreciated.
k2m2.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/WMjUHS4OssY
Very small map with an interesting, but annoying, mechanic. After getting the Silver Key, monsters will keep respawning, every 15 seconds, until you disable the cloning. It's not really an issue, as the map is pretty short. Although it messes up the total kills and makes it impossible getting 100%.
k2m3.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/zHFuSUnKUGo
Not a very long tech base map. Again, you must stop a clonning machine from respawning infinite enemies into the map.
There's plenty of Armagon entities being used, Laser Cannon, scorpions, rotating brushes, breakable floors and so on.
You will have to cross a couple of traps multiple times, so it might get annoying. But they're easy to bypass.
It's a middle of the road between average and good.
k3m1.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/ahatf5al7Ho
Just a DM map, with no enemies. It does have two secrets and an exit.
inflict.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/K3nrNasdPZk
An average map. Not super short, not very long. Gameplay is ok, visually it's decent. The neverending debris falling down is a nice touch.
The instakill spike trap on the first lift is a bit cheap, as is the lift that comes out of the lava further ahead.
One of the secrets is bugged and only the right side of the Silver Keycard door will react when trying to open it.
k3m2.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/_lSeJhhDBks
Medieval map with traps along the way. It's a bit blocky, but it looks ok.
Gameplay is average.
k4m1.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/s4t3KFvGgfg
Interesting boss map, where you fight both Chthon and Shub-Niggurath. You start with a small army of friendly enemies, that help you clear out the way to the final area. From there, you proceed to a smallish room, where you fight Chthon in a conventional battle.
Followed by mowing down Shub-Niggurath with your weapons and blowing her up with a Quad rocket.
Entertaining.
kend.bsp - Link to Nightmare 100% walkthrough: https://youtu.be/ecXl35Y9JpY
Overall, a set of maps that range from average to good. Armagon entities are used nicely, not to the maps detriment.
Traps and endless respawning of enemies seems to be a theme. Which is fine, but it messes up the total kill count and makes 100% impossible for quite a few of the maps.