“…. .- .-.. ..-.”

I am extremely surprised this was the hardest challenge. The title is morse code for the word “half”, which makes you think of fractions and morse, in other words the Fractionated Morse Code cipher. Even if you haven’t heard of it, searching “half morse” on Google gives you the same result.

Decrypting it using a tool of your choice (https://www.dcode.fr/fractionated-morse) for me gives RTCPTW0GALLONSOFH4LFMAK3WH0LEM1LK which becomes the flag rtcp{TW0GALLONSOFH4LFMAK3WH0LEM1LK}.