# Muse Dash The Muse Dash × UNDERTALE × DELTARUNE Collab is now available.

- Product: Muse Dash (https://whatsnew.fyi/product/muse-dash)
- Vendor: peropero
- Date: 2026-07-31
- Original notes: https://store.steampowered.com/news/app/774171/view/698771083706237018
- Permalink: https://whatsnew.fyi/product/muse-dash/releases/2026-07-31-the-muse-dash-undertale-deltarune-collab-is-now-a

What's New is an index, not a publisher: every entry below links to the vendor's own release notes, which are the authoritative source. Entries are labelled where they are hand-curated sample data, pre-releases, or drawn from a secondary source such as a developer blog.

Reuse: the summaries, labels and curation here are © What's New. Quote freely with attribution and a link back; wholesale republication of the corpus is not permitted — terms: https://whatsnew.fyi/terms. The vendors' own release notes remain their publishers'.

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- **added** — 8 new songs in the Song of Determination & Power Music Pack
- **added** — Hidden sheet for Death by Glamour with BOSS switch
- **added** — Hidden sheet for MEGALOVANIA
- **added** — Illustration with unique tastes of the Underground

* This is MTT News reporting!

* Humans have arrived in our world again! Please see the footage we captured...

* (Suggesting excited "ahhh" reactions from the audience)

* Yep, just as you thought——

Muse Dash × UNDERTALE × DELTARUNE Collab Confirmed !!

* The Boxer White Bear is swinging its fists at you!

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　 * Check out the 8 new songs in the "Song of Determination & Power" Music Pack!

　 * Turn on the BOSS switch in the hidden sheet of "Death by Glamour"!

　 * Ready to face Judgement in the hidden sheet of "MEGALOVANIA"?

♡ * Enjoy an illustration with unique tastes of the Underground!

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R.M.B Squad LV 1　　HP 250 / 250

[ FIGHT ] 【 ACT 】 [ ITEM ] [ MERCY ]