Here is how to get the 1st star of course 5, Boo Lake, of Luigi's Mansion 64 and how to get the same star to appear twice. You have to do both ways in this order: the way in the first paragraph then the way in the second paragraph. You have to do the first way to be able to get Big Boo to appear using the second way. Got it? I wish this wasn't so complicated but I figured it out (on accident)! I tried my best to explain this, so I hope it isn't too complicated for you!

How to get the original star to appear (first way):

Attack the 2 ghosts on the top of the main floor, then go to the 2nd door on the very left side. Attack the 3 ghosts you will see that are very close to that door you entered. After you attack those 5 ghosts, Big Boo will appear in the same place he appeared in Super Mario 64. Attack Big Boo and the star will appear at the same place as it did in Super Mario 64. Go up the giant steps and get the star.


The same star twice? (second way to get Big Boo to appear)

Do the first way to make Big Boo appear that I explained above, then get 5 ghosts that give text boxes (it doesn't matter what order or what certain text box ghosts you have to get, thank god). Go into the last door on the very right of the top of the main floor. You will notice that Big Boo appears in that room instead of where he's supposed to be. Attack him, then another star will appear. Look at the picture I took of the two stars. The star on the left is the one that the Big Boo in the wrong room (using the second way) gave me. The star on the right is the one that the Big Boo in the correct place (using the first way) gave me. Sorry if this was too complicated, I tried to make it simple but it was really hard to find out this trick!

Hey there friend! Nice to see you're still up to your brilliant work!

I will also benefit from this walkthrough! It's clear and descriptive, it's helpful and it's detailed! You give step by step instructions which is fantastic! Keep up the good work mate!

I hope you continue making walkthroughs! GOOD LUCK!

Well, not a bad game guide! You pretty much explained everything, even though it's not detailed but you still said what had to be said so nothing else to say but awesome job man! 

I look forward to your future guides!

Wow, I almost wrote Owo.
But that really helps with the level! It may not have much detail but you said what needed to be said. Good job!