I am so glad that I can use a path that I have tried in "Crib" and "Crib II" in this one.
Pipelining trick is surely very essential in this one so that could explain why it is PhD while the other 2 are Masters.
Edit: Forgot to give 5 stars for the picture.
I was stuck in both this and Crib II previously
I just solved Crib II and then came back to this, with some comparison I could see the way - I often miss such, should have been more aware on this in the future
I somehow found a 27, but not the 25. Interesting puzzle in terms of how little things can change so much.
Edit: Revisited 24/03/2023 and solved instantly. I couldn't even explain why I was stuck. Truely a Yoda level.
Insights