Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack
Six Legendary Tracks. One Unstable Trombone. The UNDERTALE + DELTARUNE Song Pack brings a whole new level of chaos (and possibly spiritual awakening) to your trombone.
Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack is an indie, released 12 August 2025 on SteamVR.
What Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack is
Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack was released in 2025. It is available on SteamVR only.
The premise, in the publisher's words
Six Legendary Tracks. One Unstable Trombone. The UNDERTALE + DELTARUNE Song Pack brings a whole new level of chaos (and possibly spiritual awakening) to your trombone.
How it plays
It is a single-player game with no multiplayer component.
What it launched against
Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack launched on 12 August 2025, within three weeks of Mafia: The Old Country, Metal Gear Solid Delta: Snake Eater, Wuchang: Fallen Feathers and Shinobi: Art of Vengeance.
Released around the same time: Mafia: The Old Country, Metal Gear Solid Delta: Snake Eater, Wuchang: Fallen Feathers, Shinobi: Art of Vengeance.
Official trailer
Sourced from the publisher’s YouTube channel.
Screenshots
All media
Parents
Quick answers
Trombone Champ: Unflattened! - Undertale + Deltarune Song Pack — frequently asked questions
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