Undertale released on September 15, 2015. This marks the original launch for Microsoft Windows and macOS, developed solo by Toby Fox using GameMaker: Studio.

Release Timeline

Undertale's journey began with a 2013 Kickstarter and built hype through demos. The full game dropped just 24 days after its final release date announcement.

Key port dates include:

  • Linux : July 17, 2016
  • PS4/PS Vita : August 15, 2017
  • Nintendo Switch : September 18, 2018
  • Xbox One/Series X|S : March 16, 2021

Platform| Date| Notes
---|---|---
PC (Win/Mac)| Sep 15, 2015| Original launch; Steam at 15:58 UTC9
PS4/Vita| Aug 15, 2017| 24 days post-announcement1
Switch| Sep 18, 2018| 21 days after reveal1
Xbox| Mar 16, 2021| Next-day release1

Cultural Milestone

By 2025, fans marked the 10-year anniversary on Reddit, reflecting on its decade-long fandom. The game's witty dialogue, choice-driven paths (spare or fight), and meta elements—like characters aware of resets—cemented its legacy.

"Hard to believe it’s been a decade already." – Reddit user on r/gaming

Even in 2026, communities like r/Undertale buzz with nostalgia, tying into Deltarune discussions. No major updates since ports, but Toby Fox notes official news via his site or mailing list.

TL;DR : Core release was September 15, 2015—still celebrated yearly.

Information gathered from public forums or data available on the internet and portrayed here.