This TAS collects the switch star of The Secret under the Moat in 1 B press. This is an improvement over the previous strategy by p_yoshi, which used 2 B presses (   • (OBSOLETE) SM64DS - TSutM Switch Star...  ). The improvement is to use a new Heaven's Portal spot that's faster to access, fast enough that we can reach the star before the switch timer ends. This removes the B press that was used to backflip to the star as Luigi from high up the slope.

This improvement lowers the 150 Star B press total for the B Button Challenge to 17 on most versions, and to 20 on U 1.0 (the original release). Adeal's video on the remaining B presses (   • The Remaining B presses  ) is worth watching to see what's left! The video explains the version differences too, and the improvements since it was published are listed in the description.

My discovery that lead to this improvement relates to performing a Heaven's Portal (HP), an upwarp glitch that is incredibly useful in the B Button Challenge. Josh65536 has a video explaining portals:    • SM64DS: Integer Overflow Portal  

One of the most important requirements to achieve a portal is that there must be no floor detected below the character, not even a death floor. Conversely, the requirement to transform a Hell's Portal (a guaranteed death) into a Heaven's Portal is to move above a floor after the portal begins. Finally, before you achieve a Heaven's Portal, the character's motion angle cannot be changed. This set of constraints means that, intuitively, Heaven's Portals are only possible to perform if there is some form of gap in the course, such that there is an Out of Bounds (OoB) area with no floor that is between two areas with floors. Using this arrangement, a portal can be started from the first area by using the OoB area in the middle to accomplish the portal, and then moving above the floor on the other side makes it a Heaven's Portal.

However, I found a way to perform a HP without the OoB area being between two floors. It turns out that with TAS precision you can barely turn away from an OoB area while still starting a portal, such that you slowly but surely move back over the course. In this video I turn about 2° back towards the course, an angle which was enough to be considered over a floor after a couple of seconds and achieve a HP!

To begin, I used a pause clip to enter The Secret under the Moat (TSutM) as Luigi. This glitch was shared in 2019 by jraug44, though she discovered it years earlier before joining the community. Pause clipping works because some objects become intangible while far from the camera, and pausing in most courses displays an aerial view, by moving the camera far away. Amusingly, pause clipping trivialises entering TSutM without Wario which makes the complex hyperspeed method (   • Super Mario 64 DS - The Secret under ...  ) fairly unnecessary. That method is still the only way to enter TSutM without Wario if the moat hasn't been drained, but that doesn't serve much purpose. Josh65536 has a video explaining pause clipping in detail:    • Super Mario 64 DS: Mesh Colliders Par...  

Inside TSutM, I get OoB using a clip discovered by p_yoshi (   • SM64DS - TSutM Clip (Downwarp)  ) then use a HP at the top of the slope, possible with my new technique, to reach the switch and press it. The B press lasts from when Luigi starts his backflip until he reaches the first corner of the seam. It should be possible to hold B for the entire star with better optimisation, but because my Y run ran out (   • SM64DS - Y Run Explanation/Tutorial  ) I needed to release B to dive. Even with the faster HP spot, making it to star before the 40 second timer expires is very difficult. My first attempt was 16 frames too slow, and it seemed like the TAS might need redone from the switch press, which Migu started working on. However, I managed to save 18 frames at the end section, beating the timer by just 2 frames. I then delayed touching the star by 2 frames on purpose, because that has the fun glitchy properties of playing the star disappearing jingle and messing up the camera.

We don't have any ideas to remove the final B press to travel from the switch area back to the main area. There is one alternate way to cross the gap in 1 B press that Adeal found, which is to let the balloon Mario timer run out and then wall jump up. Even though it's possible with precision to press the switch as balloon Mario, this strat is too slow to get the star in 1 B press overall, considering how tight the timer is.

Note that this star is technically already possible in 0 B presses using the Remote Interaction Glitch (RIG) (   • The Secret Under the Moat: Switch Sta...  ). However, strategies using RIG are counted separately for the B Button Challenge because each use of the glitch takes hundreds of years, as it requires spawning over 4 billion objects. Josh65536 explains RIG here:    • The Secret Under the Moat: Switch Sta...