Swooping in here to suggest what all of the new stuff on this page should be, considering the release of the full version of Undertale: Yellow [God, 7 years, huh?]. Saying this as someone who has gotten all 3 main endings to the game.

[THERE WILL BE SPOILERS FOR UNDERTALE YELLOW BELOW THIS... I'M NOT SURE WHY YOU'D EVEN BE HERE TBH BUT LET'S PLAY IT SAFE AND PRACTICE OUR GUN SAFETY, YEAH?]

A lot of this will be modelled after the original Undertale's rules in terms of style, just so ya know. This will also be mostly CATEGORY RULES, not GAME RULES, as obviously, there isn't too much technical knowledge on how Undertale Yellow works right now, although some folks from the UT board will probably figure things out real quick.

PACIFIST

• Complete the Pacifist Ending by sparing everyone you meet, ultimately defeating Ceroba and sparing her.

• Timing starts on pressing "BEGIN GAME" on the instruction screen, and ends when closing Flowey's last line of dialogue after the final boss.

NEUTRAL

• Complete the Neutral Ending by killing at least one monster, and then outlasting Flowey.

• Timing starts on pressing "BEGIN GAME" on the instruction screen, and ends when closing Flowey's last line of dialogue after his fight.

GENOCIDE

• Complete the Genocide Ending by killing enough monsters in all areas, ultimately ending in defeating Martlett on the UG Apartment rooftop.

• Timing starts on pressing "BEGIN GAME" on the instruction screen, and ends when pressing Z to fire your soul's laser at Asgore.

[Note: There is technically a completely alternate ending to Pacifist that would probably qualify as an ALT neutral ending for selecting to fight Ceroba after her fight, but it's probably too menial to count as a category]

[Note #2: There's an upcoming difficulty patch to Yellow that will likely end up heavily affecting how easy certain fights will be [Genocide Martlet, Pacifist Ceroba, etc]]

there’d probably be 2 different neutral categories: neutral (with aborted genocide) and neutral no aborted genocide.

it hasn’t been exactly timed yet if aborted genocide is faster though.

edit: it’s been timed out and aborted geno is slower, but i think it could still be a misc category.

Flowey's dialogue in the pacifist ending is automatic, you can't physically close it yourself lol

Also for Pacifist, do you want to count the post-credits scene with the raft or no, since you can mash through all that text too?

The Top-Tier question is when will we have a Category listed for the Full Game?

I already have a Run done for Genocide that totals to around 1 Hour and 46 Minutes. (When Asgore was blasted by Justice) (No Easy Mode Used) I watched all the way through the Credits, just in the case that the Credits end up being counted.

(Done on Version 1.1.)

Edit: I did another Run with the same conditions, which is 1 Hour and 37 Minutes.

As for ideas, there should be a Category for beating all of the Bosses prior to the Neutral Ending's Final Boss Fight.

Since they provide a different fight as a whole.

And as a Sub-Catagory there should be a (Ceroba) and a (Starlo) Sub-Catagory, since it's either one or the other.

Undertale Yellow also has an easy mode which wouldn't really be much faster, just for those with less skill at the game (like me)

In my opinion a New Game + category would be nice due to a entire cutscene on flowey being skipped, plus the tutorial at the beginning.