Super Mario 64 DS - Metal-Head Wario Can Move BCCless

I show off two different strats in this TAS: make sure you don't stop watching early!

BCCless stands for Blockless, Coinless, Cannonless. This is the SM64DS equivalent of the Capless, Coinless, Cannonless challenge in SM64. This challenge aims to collect as many stars as possible without hitting any ? Blocks, collecting any coins, or entering any cannons.

The first strat I show off was recently discovered by me, and is only possible on the PAL version and 1.1 revision. This is because of how bouncing on enemies works: on v1.0 you will continue doing the action you were already doing after a bounce, e.g long jumping onto an enemy means you will stay in the long jump animation after bouncing. On v1.1 and PAL, you will always be set to a state as if you had just done a regular jump. This means that you can do a glitch called the Star Carrying Glitch on v1.1 and PAL using basically anything that causes you to bounce, due to your action being reset (   • Super Mario 64 DS - Star Carrying Glitch U...  ). This doesn't just let you carry stars in Yoshi's mouth, it allows anything that will usually be instantly swallowed to be carried, but it was originally discovered with stars and "Anything-That-Can't-Usually-Be-Carried-In-Yoshi's-Mouth Carrying Glitch" doesn't have quite the same ring to it.
After entering HMC as Yoshi with Wario's cap, I go to the next room and break the Wario brick. I then lose the cap and quickly eat and spit out the scuttlebug towards the mushroom. By doing the Star Carrying Glitch and then jumping repeatedly, I can take the mushroom all the way over to the door.
Now I do a glitch I found that makes this strat possible: by touching the mushroom and the door on the same frame, you can turn big after going through the door, which is obviously not meant to be possible. When Yoshi is big it's possible for him to walk underwater, and interestingly the sound effects he makes are the same as when Wario has the metal ability. With good movement, it's possible to make it to the ! switch just before the mushroom runs out, and Yoshi can actually press it while big. From there the rest is simple.

The second strat I show off has been known for a very long time. By going into first-person while on top of the Wario brick and against the wall, it's possible to clip OoB. This works because the brick is unloaded when far from the camera, and using first-person in just the right way puts the camera far enough away for long enough so that you can fall through. From there you can just swim OoB and jump back inbounds next to the door to enter the room with the star. Note that you can't just go directly to the star, as you have to open the door for it to be loaded.
This strat is the faster of the two, and the video wouldn't be complete without including both.