Review by Colin Phipps

"A Hidden Mountain Factory" is a large level for Doom 2; you start in the rocky mountains, and descend into a cave where you find the "hidden" entrance. It's very well done, a great transition from the dark spooky cave to the bricks and metal style.

The architecture is very good, lots of detail and good features like acid, computer panels, sensible use of textures, lighting... it's all there. I also liked the way you emerge at the end back out into the caves and escape the base; all fitted into the plot nicely I thought.

The level struck me as very tough; ammo was limited in some places, and there are a lot of traps and powerful badies around. Then again I was using a different source port for the first time in a while, that never makes things easier. I had to take quite a few tries at several of the fights. The room layouts etc are important to the fights, making even the straight fights tricky. There are plenty of traps too.

There is an interesting level progression, and a few secrets to look for as well. Overall, definitely a good level, just make sure you pick a suitable difficulty level ;-).