Believe it or not, it’s already been five years since the launch ofUndertale. A blend of visual novel, RPG, and retro arcade action, Toby Fox’ labour-of-love won over an army of fans with its emotional narrative, iconic cast of characters, and great chiptune soundtrack.

To celebrate five years of Flowey, Papyrus, Undyne, Sans and pals, Fox and Fangamer are teaming up to presenta free online “concert stream,”with select tracks fromUndertale‘s great OST being performed live by MUSIC Engine. The concert is scheduled for Tuesday, September 15, with festivities kicking off at 19:00 PT / 22:00 ET. Fans can watch the concert on the officialUndertalewebsiteandYouTube channel.

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On the same day, a selection of newUndertalemerchandise will also be released. The new range will include a“Stay Determined” shirt, among other items. Proceeds from merch sales will be donated to theUnited Way COVID-19 Response and Recovery Fund.

Undertaleis available now on PS4, PS Vita, PC, and Nintendo Switch.

The ghost at the end of the hallway

https://t.co/CiqBCnPvlAhas been updated! First announcement…

♪UNDERTALE 5th Anniversary Concert Stream♪(organized by Fangamer & 8-4)

Picking up the smiley face post-it off the broken mirror

On 9/15 at 7PM PDT (10PM EST), we’ll be streaming a free orchestral concert by MUSIC Engine! Check outhttps://t.co/CiqBCnPvlAfor details!pic.twitter.com/CGqrAJQ1wx

— tobyfox (@tobyfox)June 02, 2025

John and Molly sitting on the park bench

Close up shot of Marissa Marcel starring in Ambrosio

Kukrushka sitting in a meadow

Lightkeeper pointing his firearm overlapped against the lighthouse background

Overseer looking over the balcony in opening cutscene of Funeralopolis

Edited image of Super Imposter looking through window in No I’m not a Human demo cutscene with thin man and FEMA inside the house

Looking at the ghost of Jackie inside the lighthouse