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Library/Game/Undertale
Grade A23 sourcesHIS-01336

Undertale

Game · 2015 · Notable

56Editable slideCertificate

Undertale passed one million sales as fan art, playthroughs and forum voting spread.

Trailer · FwugRadiation on YouTube
Clip · UNDERTALE and DELTARUNE Official on YouTube
Undertale key art: the fallen human in a pool of light among golden flowers
Toby Fox / Undertale Tumblr
Sans in Waterfall, from the official console screenshots
Toby Fox / 8-4
Undertale release trailer: Make strange friends
FwugRadiation on YouTube
Undertale screenshot at Grillby's bar
Toby Fox / PlayStation.Blog
Undertale 5th Anniversary Concert title card
UNDERTALE and DELTARUNE Official on YouTube
Undertale screenshot of the snowy town of Snowdin
Gematsu
Sans, the skeleton fans adopted as a meme
Edge / PC Gamer

Spread Score

How it works
Reach49ContagionNo data yetBreadth80Velocity10Longevity8656

Numbers

Steam all-time peak; live tracker, reached March 2025
11.1K
As of Oct 22, 2026 · Open web · Steam Charts
Observed peak date
Week of Jan 19, 2016
Sep 15 ’15 to Week of Jan 19, 2016
Platforms
3
Started on Open web
Origin
Seeded
Gaming

Mechanics

  • Underdog
  • Identity badge
  • Fandom mobilisationPrimary
  • Platform jump
  • Press loop

How it spread

Trace the origin

Fox crowdfunded Undertale, then released it in September 2015. Fan comics, YouTube playthroughs and a GameFAQs voting campaign spread it beyond players. Sales passed one million in early 2016; Deltarune and orchestral concerts extended its afterlife.

Observed peak within the documented measurement window; not an all-time maximum. Dates use the stated precision; chart positions are date anchors.

Wikipedia viewsMar ’13JulJun ’14Sep ’15DecMar ’16SepMar ’17SepMay ’18NovAug ’19DecObserved peakOpen webPressReddit
Open webPressReddit

13 more events on this chart

Join free to see them

Timeline (16)

  1. May 2013

    Toby Fox precursor · May 23 ’13

    Fox released the Windows demo and asked players to tell their friends.[1]

    Open the first post ↗

  2. June 2013

    Toby Fox precursor · Jun 24 ’13

    Fox announced the Kickstarter and a Macintosh version of the demo.[2]

    Undertale key art: the fallen human in a pool of light among golden flowers

  3. July 2013

    Kickstarter backers precursor · Jul 24 ’13

    The Kickstarter closed with $51,124 pledged by 2,398 backers.[3]

  1. seed · Sep 15 ’15

  2. press · Sep 21 ’15

Join free to see the other 13 events and the full chart. Free, on every case.

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Why it worked

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  1. 1
  2. 2
  3. 3

Pro opens the playbook, all 11 sourced numbers and 23 sources. Start with a free account.

Join freeGo Pro
Origin
Seeded
Sector
Gaming
Region
US
Steam all-time peak; live tracker, reached March 2025
11.1K
As of Oct 22, 2026 · Open web · Steam Charts
Evidence
Grade A

Spread the same way

Game · App stores · 200968

Angry Birds

Rovio (developer and IP owner); Chillingo (original iOS publisher)

Rovio said its slingshot game sold over 6.5 million iPhone copies before Android.

6.5M sold

1 / 8

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New cases, every week

How the next thing spread, the week it does.