Mysterious pretendco Dead End on my Mac?

[oVBCLG]

I was surprised to see a few mounted disks on the DiskUtility that didn't appear on the devices tab on finder (I enabled it on the finder preferences).

One of the mounted disks is called "Dead End" by Pretend Co deployment services (see the attached image).

There's also a mounted disk called "Hello World" (I forgot to screenshot it before I ejected it).

I'm certain that I've never opened anything that says Dead End or Hello World, and what's strange is that those disks only appear on the DiskUtility but weren't visible on the finder devices tab.

My searches only show a few results like these:
http://krypted.com/mac-os-x/nfs-not-dead-yet/
http://salesresources.apple.com/go/mac/itconfigurationguide2014.pdf

And there's also a site that has the Dead End application:
http://5.150.194.170

Does anybody know what they are, and how come they ended up as (invisible) mounted disk on my Mac? Should I be concerned?

 

[Flint Ironstag]

These sound like lesson plan apps from my days as a MacOS certification trainer. I'm not kidding - there were little apps to present problems for students to overcome. I may have some old backups with them floating around that I can check.

ex: an app is deployed on all the student machines so when they log in, tons of windows open, and one is blasting audio. Their task is to learn how to use OS functions (in this case expose (can't find the damn accent shortcut)) to expand the windows and find the one that's playing audio and silence it.