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

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

Is this a sans reference in Smash Ultimate? : r/Undertale

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

UnderTale in Smash Bros.? « Undertale « Forum « Starmen.Net

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How happy I am for the SANS reaction of the Smash community

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

Leaked image of a new stage in Super Smash Bros Ultimate. : r

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