Semi Frequent Undertale Factsさんのイラストまとめ

* The famous bootleg Alphys Plushie's design most likely takes inspiration from the Alphys that appears in the website Dragoart, who's also the Alphys that appears in Undertale the Musical by LHUGUENY.

* In the files you can find concept art for Photoshop Flowey, what's interesting about this art is that one of the souls is PINK, a pink soul has never been adressed by Toby anywhere, could be a scrapped soul or a different color for an existing one

Submitted by: @Christiando227

* Looking into the mirror has different text depending on the place and route you're on.

- Neutral
- Neutral (New Home)
- Pacifist Epilogue
- No Mercy

Submitted by: @spooplol

* While Frisk can never be seen making any expression, characters mention Frisk making various expressions and faces, which would suggest Frisk does emote but it's never shown to the player as Overworld sprites rarely emote.

* The Quiche, Bad Memory and Undyne's Letter are the only items with special text when thrown away in Undertale.

Submitted by: @punykirby

* Killing Lesser Dog grants you access to the "fire exit", however you can't go through since you aren't made of fire.

* The Undertale Art Book states that Madjick was based off Rayman and Plok.

* You can find Mettaton undergoing repairs in Alphys's room after sparing him and coming back to Alphys's Lab.

* In Hotland, Sans says that he doesn't judge you, however this is in fact a lie as he does indeed judge you for your actions near the end of the game.

Submitted by: @JuncajDon

* If your FUN Value is in between 46-50 once you reach Papyrus's station, Alphys will call you thinking you're the Pizza Delivery.