The Undertale 10th anniversary has officially arrived, and the gaming community is going absolutely wild. On September 15, 2025, indie gaming legend Toby Fox marked a decade since his underground masterpiece first graced our screens, and the celebration is everything fans hoped for and more.
The Anniversary That Almost Broke the Internet
When Toby Fox dropped the Undertale 10th anniversary newsletter, Reddit practically exploded. The r/Undertale community went into overdrive, with fans sharing heartfelt stories about how this simple RPG about determination and kindness changed their lives. One fan shared how Undertale taught them about LGBTQ+ acceptance, while another credited the game with inspiring their art career.
But this isn’t just nostalgia talking. Fox delivered real content for hungry fans, announcing a special two-day streaming event that has everyone marking their calendars.
Double-Feature Stream Event Announced
Here’s where things get interesting. The original plan was to stream on the actual anniversary, but Fox realized September 15 fell on a weekday. His solution? A massive weekend celebration featuring a complete Undertale playthrough across two days.
The streams are scheduled for September 20 and 21 at 4 PM PT, and Fox wasn’t kidding about the scope – initial testing showed the full playthrough would take over 8 hours. That’s commitment to the Undertale 10th anniversary celebration right there.
Deltarune Chapter 5 Gets Its First Official Mention
While fans were celebrating the past, Fox casually dropped a bombshell about the future. For the first time ever, he officially mentioned Deltarune Chapter 5 in the newsletter, though he was characteristically cryptic about details.
“Some of you might be wondering what kind of Chapter it is… Well, right now, there is no reason to tell you that,” Fox teased in the newsletter. Classic Toby behavior, but the mere acknowledgment of Chapter 5’s existence has sent theorists into overdrive.
The newsletter also confirmed that translation work is planned to begin by the end of 2025, giving fans a concrete timeline to work with. After years of waiting, having actual deadlines feels revolutionary for this fanbase.
Community Response Reaches Emotional Heights
The Undertale 10th anniversary has unleashed a wave of emotional testimonials from players worldwide. Stories are pouring in about how the game provided comfort during difficult times, introduced players to new perspectives, and inspired creative careers.
One particularly moving Reddit post described how Undertale served as a “safe haven during times of fear” for a player going through family difficulties. Another credited the game with expanding their music playlist by “at least ten more soundtracks.”
Special Famitsu Interview Reveals Development Secrets
Fox also participated in a special 10th anniversary interview with Weekly Famitsu, sharing rare insights into the development process and dropping hints about future projects. The interview revealed interesting tidbits about character relationships, including updates on Sans and Toriel’s evolving dynamic in the Deltarune timeline.
Perhaps most intriguingly, Fox mentioned a hidden easter egg on Undertale’s title screen – typing “ball” triggers a secret melody that was originally intended for a friend’s cancelled game project. These kinds of details show how much thought went into every aspect of the original game.
Looking Forward: The Legacy Continues
As the Undertale 10th anniversary celebrations continue, it’s clear this isn’t just about looking backward. With Deltarune development progressing and new content on the horizon, the Underground’s influence on indie gaming shows no signs of waning.
The anniversary has proven that great storytelling transcends technical limitations. In an era of AAA blockbusters and massive budgets, a simple RPG about a child who refuses to fight continues to move players to tears and inspire new creators.
Ten years later, Undertale’s message of determination, kindness, and the power of choice remains as relevant as ever. Here’s to another decade of filled with the same hopes and dreams that made this journey possible.
Frequently Asked Questions
When is the Undertale 10th anniversary streaming event?
The celebration streams are scheduled for September 20 and 21, 2025, at 4 PM PT. Toby Fox will play through the entire game across both days.
What new information about Deltarune was revealed?
Toby Fox officially mentioned Deltarune Chapter 5 for the first time, though he remained cryptic about details. Translation work is planned to begin by the end of 2025.
Is there a hidden easter egg in Undertale?
Yes! Typing “ball” on the title screen triggers a secret melody that was originally composed for a friend’s cancelled game project.
How long will the anniversary streams be?
Initial testing showed a complete Undertale playthrough takes over 8 hours, which is why it’s being split across two separate days.
What special merchandise was released for the anniversary?
Toby Fox released special 10th anniversary merchandise, though he indicated this won’t be the only merch drop planned for the celebration.
Will there be any updates to the original Undertale game?
While no major updates were announced, Fox has previously joked about adding high-quality 3D rendering for the annoying dog character in any potential HD remaster.
How has the community responded to the anniversary?
The response has been overwhelmingly emotional, with fans sharing personal stories about how Undertale impacted their lives, careers, and perspectives over the past decade.