TS!UNDERSWAP [Undertale Fangame]
A downloadable fangame for Windows, macOS, Linux, and Android
TS!UNDERSWAP is an unofficial fan-made reimagining of Toby Fox's UNDERTALE, made by Team Switched (TS).
The game currently features the first two areas, Ruined Home and Starlight Isles! It's available for free on Windows, Mac, Linux, and Android.
(Estimated playtime for first run: at least 4-6 hours.)


Explore a new world inspired by the works of Toby Fox.
A reimagined Underground boasting new area themes, level progression, and expansive locations rich with original content.
Expanded gameplay mechanics, new features, and quality of life improvements both original and DELTARUNE-inspired.
- A JOURNAL for keeping track of monsters encountered, side quests, and collectible items.
- Brand new puzzle and mobility mechanics.
- DELTARUNE-inspired overworld dodging and inventory quality of life additions.
- Extra colored sprites options and trophies.
Battle monsters new and old, with re-imagined versions of returning enemies and bullet patterns.
Enemies can be nonviolently pacified through interaction, though you can still destroy your foes. The world will react depending on your choices.
Choose your own path, with emphasis on player choice and replayability.
Encounter a cast of returning characters in new roles, alongside completely original characters.
Heavy emphasis on attention to detail to provide fans of UNDERTALE with something familiar, yet brand new.
Features original artwork and music inspired by the style of UNDERTALE and DELTARUNE, including remixed melodies and brand new compositions.
In Memory of Offtopic.
You brought joy to so many people. Rest in peace, friend.
Cover art by SuperKirbylover
UNDERTALE © 2015 / DELTARUNE © 2018 by Toby Fox, Temmie Chang & Co. Thank you for creating these wonderful games. You've inspired us to follow our passions and create something new. Underswap AU by the community
(We are NOT affiliated with Toby Fox!)
| Published | 10 hours ago |
| Status | In development |
| Platforms | Windows, macOS, Linux, Android |
| Author | Team Switched |
| Genre | Role Playing, Puzzle |
| Made with | GameMaker, Aseprite, Audacity, FL Studio, Paint.net |
| Tags | 2D, Bullet Hell, Fangame, GameMaker, Indie, JRPG, underswap, Undertale |
| Average session | About a half-hour |
| Languages | English, Italian, Russian |
| Inputs | Keyboard, Xbox controller, Gamepad (any), Touchscreen, Playstation controller |
| Accessibility | Color-blind friendly, Subtitles, Configurable controls, Interactive tutorial |
| Links | Homepage, Bluesky, Discord, Support, YouTube, Twitter/X |
| Content | No generative AI was used |
Install instructions
Windows: Requires a 64-bit computer. Extract the ZIP file to a new folder, run the EXE, and you're good to go!
Mac: Requires OS version 10.13 (High Sierra) or above. Open the installer, move it into your Applications, and you're good to go!
Linux: Designed for a recent version of Ubuntu, in AppImage format. Some packages may need to be installed on other distributions, as per GameMaker's documentation.
Android: Extract the ZIP, and use the APK file to install the app to your device. Supports most semi-modern Android phones.





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