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A few background points:
TAS = tool-assisted speedrun. Someone using an emulator tries to aim for the most efficient speedrun of a game as possible, under certain conditions, which may or may not include use of glitches, having to get the best ending, etc.. No hacking is allowed, just normal controller inputs (though possibly at speeds not physically possible for humans to accomplish).
Wall-sinking: A glitch in Castlevania: Harmony of Dissonance that allows the player-character to teleport/warp/whatever to all sorts of very disconnected locations, in certain predefined manners. This requires the player to somehow get through the walls of the game area, hence the name.
Furniture: For some reason, a sidequest in Castlevania: Harmony of Dissonance involves collecting a bunch of pieces of furniture and placing them in a certain room. Getting all the furniture makes just a minor change to the ending.
This movie, which does not use wall-sinking (hence its name "in bounds"), is a pretty good illustrator of sequence elements in the design of Castlevania: Harmony of Dissonance. It would be nice if it didn't involve door-glitching as well (which is used to get to one item and one warp point much earlier than should be possible), but...hey, this is the closest thing to a normal non-glitched speedrun that's on TASVideos (a site that hosts TASes).
But...they say that this run was obsoleted! By...this run, of all things! So this run collects all the furniture as an additional condition, but does use wall-sinking, allowing it to glitch its way through much more wildly.
These should be two separate threads, NOT the same thread with either one obsoleting the other. The wall-sinking glitch is a complete and utter game-changer--perhaps even more so than having to collect all the furniture. Note that the all-furniture wall-sinking run is actually shorter than the no-wall-sinking (i.e. in-bounds) run. There are like 16 pieces of furniture...but they can be collected in less time due to the way wall-sinking allows their locations to be microtargeted. That's why that's not even a fair comparison.
Now if only they had a TAS with no glitches at all, normal game mode (i.e. not the hidden character, who plays very differently).