Descent: The Enemy Within - All Secret Levels
Custom Descent campaigns are nowhere near as abundant as in Doom, so finding a high-quality one is a rare treat. Descent: The Enemy Within is one of them. Intended as an unofficial prequel to the series in terms of plot, The Enemy Within features a total of 32 levels (26 main + 6 secret), a new soundtrack, and 27 all-new enemies (21 common + 6 bosses).
I recently did a full blind playthrough of the campaign on my Twitch channel (http://www,twitch.tv/spootybiscuit). While there were some low points (hokey guitar-heavy midi soundtrack, occasional overuse of level symmetry, over-abundance of enemies with the "plasma counter" trait) and I still consider the original Descent II levelset to be a generally superior product, The Enemy Within featured a lot of clever level and enemy design, remaining an impressive and very enjoyable campaign (I would go as far as call it better than Descent II: Vertigo - the official Parallax-made expansion pack for the original game).
On the topic of the video, during my run I made the discovery that not only are most of the secret levels very well hidden, but also very challenging in and of themselves. For those of you who tuned into the live run and were curious about the solutions to the secret levels that had me stumped, here they are. This video will show off how to reach the secret levels, how to clear them, and how to reach any notable hidden item stashes in them.
This was played using D2X-Rebirth v0.58.1: http://www.dxx-rebirth.com/download-dxx-rebirth/
Details and download for the campaign can be found here: http://www.descent2.de/tew-intro.html
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Descent II Statistics For SpootyBiscuit
Currently, SpootyBiscuit has 17,097 views for Descent II across 44 videos. The game makes up 11 hours of published video on his channel, or 4.83% of the total watchable video for Descent II on SpootyBiscuit's YouTube channel.