So! I just found a CLEAR reference to Undertale in Smash Ultimate - Super Smash Bros. Ultimate Forum - Neoseeker Forums

So, I've been binging smash ultimate since it come out. And the only Challenge i have left to complete is the 200 quickpl

Guide to beating 'The True Arena' (Guide Completed!) (Spoiler Free

Just started watching the show. I like the reference to Sans

Smash Bros. Creator Sakurai's Undertale Anniversary Post

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Super Smash Bros. Ultimate - The Newcomers (Sans Reveal Fan-Made

Undertale's Sans is in Smash Ultimate – kind of - Dexerto

Rattle's Undertale Smash Or Pass by Saturn-Domo on DeviantArt

Alan maretsky

Every Undertale Reference in the Sans Reveal Trailer for Super