Dusttrust universe: You die and Chara escapes with Flowey.

DTLG universe: You are thrown into the void and reset to Hard Mode, where the path splits.

ZYDCN universe: You don't know what happens as the game finishes before the monster can be killed. So they technically still live.

Stryker universe: The ending is incomplete.

Toby Fox universe: Dog interrupts and it's all just an act.

ULB universe: You're thrown out of the underground and monsters can live at peace.

OMOCAT universe: Depends on what you picked up.

FDY universe: You wouldn't even make it to Phase 4, even if you tried.

Every kid's show universe: Never mind they're magically friends now, lesson learned, don't do this, blah blah blah...

Every adult's show universe: Stop watching.

Anime universe: You win with the power of friendship, because you love her so much and your parents are talking from the afterlife.

Video game universe: Just retry, it can't be that hard.

Fairy tale universe: Magic always win.

Scientific universe: Umm, actually, you couldn't get this far anyway.

Mathematics universe: Negative b plus or minus the square root of b squared minus four a c over two a.

English literature universe: Thou shalt not pass.

Sega universe: Gotta make it faster.

Nintendo universe: We'll sue you for making this.

Rare universe: Humans are controllers.

X universe: Drama go brrrrr

Game Theory universe: The temperature of this final phase would be a sweltering 2,000 degrees!

Fanon universe: Phase 8, Phase 9... uhh, what was I doing again?

Reaction universe: This is good enough.

Dubbing universe: I have 500 forms and you haven't even seen the first one.