Ling's Blake Stone Maps: E1 [PC w/ BStone]
This is one of seemingly only a few custom map sets that exist for Blake Stone: Aliens of Gold.
This mod in particular piqued my interest because the one bit of advice offered by its very brief readme is that progression will sometimes be tucked away in secret floors. This very much speaks to me, since the one thing I would've liked to have seen more of in the vanilla episodes was cross-floor exploration (e.g. switches that affect something on a different floor).
Unfortunately, the first thing I ran into in the first episode was a severe lack of resources on the third difficulty - so much so that after half an hour I decided to dial it down to the second difficulty so I could focus on the level design and still get through a full episode per stream.
The first episode did not tuck any required progression in secret levels, but did hide some cross-floor switches in secrets that then led to even more secrets. It's also worth noting that just as vanilla Aliens of Gold features twice as many secret levels as Wolfenstein 3D, Ling's Blake Stone maps feature twice as many secret levels as vanilla Aliens of Gold. (AoG featured more map slots than were ultimately used; this makes use of some of those placeholders, as evidenced by their leftover titles.)
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At present, CnEY has 517 views spread across 12 videos for Blake Stone: Aliens of Gold, accounting for over 1 day of watchable video on his channel. This is 1.78% of the total watchable video for Blake Stone: Aliens of Gold on CnEY's YouTube channel.