I just unlocked the last yellow dead end and had the same reaction. (Btw, do you know the anwser/rule to Evolve (Yellow top right), the hints doesn't help me ?)
I knew it was that but couldn't get the pattern and even after the guy that made the walkthrough explained it it was still hard to imagine because it's (warning spoiler) a letter loop that doesn't mean anything (and the background is missleading because it's the same as golden spiral)
