Hi! I also got the first and the last part correct, but I still don't understand why you had to invert the 7 and 0 to get the correct characters in part 2?

Hello! As I wrote in write-up - I didn't get clear rule when you should invert bits in some octal numbers. So I just tried all combinations of inverted-noninverted bits that give printable characters. There are not so many of them.

An explanation about 0's and 7's: the lower and the higher note are actually the same note but with one octave of difference. In each part the lower note is the tonic (i.e, the main note) for the current tonality (C for the first part in C Major, F for the second part in F Major, E♭ for the third part in E♭ Major).

So as there are only 7 different notes, they chose to give both values (0 and 7) to the tonic note, be it the lower one or the higher one. But I think it was totally random, there was no criteria, I had to do the same as explained in this writeup :)

I'm not buying the 0s and 7s explanation - this was a poorly designed level. Sure, the notes are the same in the scale, but it makes no sense for them to decide that 0 and 7 will both map to the tonic, then decide to use the tonic in two octaves that have no relationship to the original numbers.

If they wanted to use a 7-note scale, they should've used digits modulo 7. If they wanted to use octal, they should've accurately mapped that to 8 distinct notes. As far as I can tell, they just screwed up here. Also, the PDF was changed halfway through the CTF, changing one of the tonic notes in the first segment from the low to the high octave... which again means that distinction was important. 2/5 stars - decent chal concept, but botched execution. Proofreading this stuff isn't hard.

Also, the p8ny -> p0ny error. That also threw me off, thinking I was missing some rule that would've also fixed the issues with the second phrase.