"all-in-the-mind" confidence course

"Confidence" courses used by schools & other institutions (i'm not talking about those used by the military or law-enforcement) work mostly on exploiting people's natural fear of heights - rope bridges, jumping across platforms on top of poles etc.

They are challenging because they are physically demanding & have real potential for danger. Accordingly they have many disadvantages; they require expensive land & equipment to set up, have seasonal usage, and leave their operators open to lawsuits if a participant hurts themself.

I propose a different kind of confidence course; that would be indoors and pose absolutely no physical danger whatsoever (and participants would be fully aware of this).

The challenges are purely psychological... and all the more scary because of that. Some would exploit the fear of the dark: crawling through a pitch-black tunnel or maze (lined with soft materials) that starts off at floor level; sliding down a 'funnel of no return' into a completely black hole - that only falls a few feet onto a mattress (but you don't know that until you actuallly do it). Other challenges would be designed by cognitive scientists using optical illusions - walking across a floor that appears to be a narrow bridge over a deep crevasse, perhaps created by mirrors on the floor & ceiling.

Your rational mind knows it's completely safe, but your 'primitive' mind overrides this & sets your heart racing.

There are of course cheesy fairground sideshows that attempt this (hall of mirrors etc), but they are only a bit of fun & all over in a few minutes. I want something more serious & grown-up, that takes maybe an hour or more to complete and scares the sh*t out of you!