Revenue is a rough estimate from public install counts × genre ARPD — order of magnitude only.
Sudden Changes
This is a completely free to play fan-made unofficial project based on the original Undertale™ game created by Toby Fox. All rights, characters, and assets belong to their respective owners. This game is a fan work that is not affiliated with Toby Fox or the official Undertale team. For any copyright inquiries or asset removal requests, please contact me directly at kywoo0130@gmail.com. I respect intellectual property and am fully committed to resolving the issues! * Undertale By Toby Fox * Created By xiaoQ * Android Port By Ilka * Released By KYwoo This game is about the Sans boss fight in Sudden Changes. The Story: 【NO AU】Sudden Changes is a role swap following the basic rules of Storyshift with only the lost souls, along with Mettaton, Napstablook, Chara and Asriel changing positions.
Estimated lifetime revenueLow confidence
$94.6Kgross
$23.7Klow → high range$378.6K
Net to developer$62.9K
Modeled estimate, not a reported figure. How we estimate →
Est. copies sold
31.5K
mid estimate
Audience
Installs
How many people have installed this game, as the storefront reports it. This number is worldwide — unlike the price, the same package answers with the same install count in every market we asked — so it carries no country. Each source below is a different kind of number and they are never drawn on one axis.
Installs counted by Google Play31,547
Sep 16, 2026 — Sep 18, 2026 · 3 readings
Google Play shows “10,000+” on the store page.
Play publishes a precise install counter alongside the rounded step users see on the store page. This is that counter, worldwide, as it stood each day we asked.
Of the eight storefronts we track, only Google Play publishes an install count we can read. Where a store publishes nothing of the kind, this panel shows nothing rather than a zero.
About
About the game
This is a completely free to play fan-made unofficial project based on the original Undertale™ game created by Toby Fox. All rights, characters, and assets belong to their respective owners. This game is a fan work that is not affiliated with Toby Fox or the official Undertale team. For any copyright inquiries or asset removal requests, please contact me directly at kywoo0130@gmail.com. I respect intellectual property and am fully committed to resolving the issues! * Undertale By Toby Fox * Created By xiaoQ * Android Port By Ilka * Released By KYwoo This game is about the Sans boss fight in Sudden Changes. The Story: 【NO AU】Sudden Changes is a role swap following the basic rules of Storyshift with only the lost souls, along with Mettaton, Napstablook, Chara and Asriel changing positions.