Unseen Morse

200 points

Files included:

39B

UnSeen.txt

Open

9 lines of whitespace... hmm interesting

random fun fact: did you know that there is a esoteric programming language called Whitespace?

Solve

Lets put the text into an online Whitespace language compiler, which would allow us to see more details.

there seems to be a mix of tabs and spaces, and when referenced to the challenge title, it can be deduced that these spaces and tabs could be translated to morse code

// to morse code (spaces = dots, tabs = lines)
..
_. 
..._
.____
...
.____
_...
.____
.

Decoding that from morse code, we get the following text:

INV1S1B1E

flag: HNF23{INV1S1B1E}