Super Mario 64 Walkthrough Part 4: Extremely Important Parts

Seriously, you do not want to miss this video (and the last for that matter because of the Wing Cap) if you are aiming for 100%. Aside from me beating Bowser for the first time and unlocking the basement which is mandatory for the game's completion (Unless you use sequence breaking glitches, but I won't go into those here), I also ran way ahead in the game's area order with the aim to activate the Vanish Cap and Metal Cap blocks to ensure that I'll be able to 100% everything as I go. I just didn't see a reason to hold out on activating those switches and getting those stars just because of area order given how open ended the game is and how much more organized the parts will be from here on out as a result of me knocking out those secret areas early.

Time Stamps:

Castle's Secret Stars:
0:00 Bowser in the Dark World + Basement Key

8:07 Explanation of the Castle's Moat before draining it.

10:43 Vanish Cap Under the Moat + Blue Switch
14:57 Cavern of the Metal Cap + Green Switch

Castle's Secret Stars Menu:
https://www.youtube.com/watch?v=TzAZEdOpUH8

World Select Menu:
https://www.youtube.com/watch?v=B4B_sHx9MVU

Enjoy!