Yeah, 61-star with Luigi is my plan. Good luck, and take your time to practice and hone your skills before starting anything.
Regarding my route planning, I tested the 'find Luigi' stars a little bit more, hoping to get Honeyhive Luigi before Battlerock Luigi. I got to Luigi's second letter without even opening the Battlerock Galaxy. However, the letter still showed the picture of him in Battlerock; then I went to Battlerock and he was there. So I guess that idea didn't work.
Also, uh... today I realized that holding A during a jumping spin makes you go higher. That might help somewhat. >_>
Regarding my route planning, I tested the 'find Luigi' stars a little bit more, hoping to get Honeyhive Luigi before Battlerock Luigi. I got to Luigi's second letter without even opening the Battlerock Galaxy. However, the letter still showed the picture of him in Battlerock; then I went to Battlerock and he was there. So I guess that idea didn't work.
Also, uh... today I realized that holding A during a jumping spin makes you go higher. That might help somewhat. >_>