Undertale

UNDERTALE

Developers
	Toby Fox
Publishers
	Toby Fox
	8-4
	Fangamer
Engines
	GameMaker
Release dates
Windows	September 15, 2015
macOS (OS X)	September 15, 2015
Linux	July 17, 2016
Reception
Metacritic	92
OpenCritic	93
IGDB	96
Taxonomy
Monetization	One-time game purchase
Series	Undertale

Undertale
Undertale	2015
Deltarune	2018

Key points

Menus layout and settings may vary according to real world time and game save. Article contains minor spoilers.

Frame rate is capped at 30 FPS.

General information

GOG.com Community Discussions

GOG.com Support Page

Steam Community Discussions

Availability

Source	DRM	Notes	Keys	OS
Retail		Collector's Edition also available
GOG.com
Humble Store		Used to offer a DRM-free version with it. The latter was still accessible on the official website Humble widget before its quiet removal.
Microsoft Store		Does not require Xbox Live log-in. Included with Xbox Game Pass for PC.
Steam		Game can be installed anywhere after initial installation. DRM-free if steam_api.dll is deleted from the game's folder.
Official website (unavailable)		Humble widget version as well as the soundtrack and game + soundtrack bundles were quietly removed on December 2021.

Demo

A Demo is available on the official website.

Version differences

The Collectors Edition includes the game and a number of physical goods.

Game data

Configuration file(s) location

System	Location
Windows	%LOCALAPPDATA%\UNDERTALE\config.ini %LOCALAPPDATA%\UNDERTALE\undertale.ini
Microsoft Store
macOS (OS X)	~/Library/Application Support/com.tobyfox.undertale/
Linux	$HOME/.config/UNDERTALE_linux_steamver/ GOG $HOME/.config/UNDERTALE_linux/
Steam	<Steam-folder>/userdata/<user-id>/391540/remote/

This game does not follow the XDG Base Directory Specification on Linux.

Save game data location

System	Location
Windows	%LOCALAPPDATA%\UNDERTALE\file0 %LOCALAPPDATA%\UNDERTALE\file9
Microsoft Store
macOS (OS X)	~/Library/Application Support/com.tobyfox.undertale/
Linux	$HOME/.config/UNDERTALE_linux_steamver/ GOG $HOME/.config/UNDERTALE_linux/
Steam	<Steam-folder>/userdata/<user-id>/391540/remote/

Save game cloud syncing

System	Native	Notes
GOG Galaxy
Steam Cloud		Not used for game save data, but to store specific player actions in the game.
Xbox Cloud

Video

Graphics feature	State	Notes
Widescreen resolution		See Widescreen resolution.
Multi-monitor
Ultra-widescreen
4K Ultra HD
Field of view (FOV)
Windowed		640x480 only. Press F4 to toggle fullscreen mode.
Borderless fullscreen windowed		See Widescreen resolution.
Anisotropic filtering (AF)		See the glossary page for potential workarounds.
Anti-aliasing (AA)		See the glossary page for potential workarounds.
Vertical sync (Vsync)		See the glossary page for potential workarounds.
60 FPS and 120+ FPS		Frame rate is capped at 30 FPS.
High dynamic range display (HDR)		See the glossary page for potential alternatives.

Widescreen resolution

With Hex Editor

Download and install HxD Run Game, then run HxD Press Ctrl+⇧ Shift+M and select Game Press Ctrl+F change Text-String to Hex-values and type in the text field: For Fullscreen 80 02 00 00 E0 01 00 00 FF For Windowed 80 02 00 00 E0 01 00 00 00 00 80 01 Replace the 80 02 and E0 01 width and height bytes according to the desired resolution. For example, 80 07 and 38 04 correspond to 1920x1080. Press Ctrl+S and click "Yes" on message box Return to the game. Note This change is not permanent, so performing this edit is required before every launch.

With Cheat Engine

Download and install Cheat Engine Run Game, then run Cheat Engine Press Ctrl+P and select Game Change Value Type 4 Bytes to Array of Byte and type in the text field: For Fullscreen 80 02 00 00 E0 01 00 00 FF For Windowed 80 02 00 00 E0 01 00 00 00 00 80 01 Replace the 80 02 and E0 01 width and height bytes according to the desired resolution. For example, 80 07 and 38 04 correspond to 1920x1080. Return to the game. Note This change is not permanent, so performing this edit is required before every launch.

Borderless fullscreen windowed

Borderless mode workaround[citation needed]
Install AutoSizer and Borderless Gaming. Run the game and both applications. In AutoSizer, select Undertale and click on AutoSize. Set the action to Resize / Position. Set the size to your screen resolution. Set the position to 0x0. In Borderless Gaming, add Undertale to Favorites, right-click and set the game to No Size Change. Restart the game.

Input

General settings. Joystick config and game start are invisible if no controller is detected.

Input settings.

Keyboard and mouse	State	Notes
Remapping		Keys are told when starting the game.
Mouse acceleration
Mouse sensitivity
Mouse input in menus		Mouse not used in game.
Mouse Y-axis inversion
Controller
Controller support		DirectInput only, only first available controller. Remove/disable all unused controllers to use XInput-compatible or second controller.
Full controller support		Fullscreen toggling F4 and quitting Esc requires keyboard or Playstation 4 controller (click Touchpad for fullscreen and hold Share button to quit). Keyboard is needed in gameplay at certain parts, but is indicated when needed and bypassed completely by not typing anything.
Controller remapping		Movement can't be rebound. Both D-pad and left analog stick can be used for moving. Controller buttons are bound to corresponding keyboard keys.
Controller sensitivity		Sensitivity setting means controllers sticks deadzone. Movement speed is always constant and done with 8-directional digital input. Sensitivity sensitivity does control how sensitivilely sensitivity bar goes, but is also controller with digital input.
Controller Y-axis inversion

Controller types

XInput-compatible controllers		Remove/disable all unused controllers to use XInput-compatible controller.
Xbox button prompts
Impulse Trigger vibration

DualShock 4 controllers
DualShock button prompts
Light bar support
Connection modes	unknown

Generic/other controllers
Button prompts		Menus only. In game only uses keyboard key prompts Z, X, C and F4.

Additional information
Controller hotplugging		DirectInput only.
Haptic feedback
Simultaneous controller+KB/M

Audio

Audio feature	State	Notes
Separate volume controls
Surround sound
Subtitles		All speech is text.
Closed captions
Mute on focus lost
Royalty free audio

Localizations

Language	UI	Audio	Sub	Notes
English
Arabic				Fan translation by Games in Arabic, download.
Simplified Chinese				Fan translation, download.
Traditional Chinese				Fan translation, download.
French				Fan translation, download.
German				Fan translation, download here or here.
Greek				Fan translation by Hardcoded_UT, download.
Italian				Fan translation, download. Only works with version 1.01 of the game.
Japanese
Korean				Fan translation, download. Potential method to get the translation to work on Linux version 1.01 here.
Polish				Fan translation, download. Only works with version 1.001.
Brazilian Portuguese				Fan translation, download here or here. Only works with version 1.001.
Russian				Fan translation, download. Also available as a bonus content on GOG.com.
Spanish				Fan translation, download.

Issues fixed

Common problems and contact information can be found at official troubleshooting page and stickied Steam community forum post.

White screen on startup

Game window displays only white color (audio is playing, but nothing is visible).

Disable variable refresh rate of your monitor (FreeSync, G-Sync)
Set fixed refresh rate for Undertale in control panel of your graphics card or disable variable refresh rate completely.

Audio fails to play when the installation path contains unicode characters

Game plays no audio and is unresponsive, window displays

Re-install the game to a location that contains only alphanumeric characters
When the game is installed to a path that includes folders that contain unicode characters, the audio will not play. In order to fix the audio, re-install the game to a different directory. For e.g. C:\ or another drive.

When OpenALSoft is installed, audio fails to play on Windows

Game plays no audio and is unresponsive, window displays

Remove WASAPI config line from alsoft.ini
Browse to %APPDATA% go to Roaming folder and locate alsoft.ini Edit alsoft.ini, remove the lines drivers="wasapi," and periods=3 Save the file and launch the game. Notes Increasing the periods value above 3 will fix garbled audio, however WASAPI will still refuse to work.

Game Doesn't Start On Linux

Game window flashes briefly before closing or doesn't appear to start at all

Use Wine/Proton instead of the native Linux version.

The native Linux release of the game does not always open due to missing packages on your system or due to Linux trying to run it in 64-bit mode instead of 32-bit mode. If these two issues are resolved, you can run the game natively. However, it is generally easier to use Proton or Wine to play the game instead. In Steam, open the Properties tab of Undertale. Then, enable the "Force the use of a specific Steam Play compatability tool" setting and select the latest release of Proton from the dropdown menu. This will download the Windows version of the game and open it via Proton. For other platforms, download the Windows version of the game and the latest stable release of Wine for your distribution. Then, run the executable with Wine.

Install required packages manually
If you would prefer to run the native Linux release of the game, you can install the necessary packages manually. Arch Linux: The package requirements are: lib32-libpulse lib32-alsa-lib lib32-openal lib32-glu lib32-openssl-1.0 Other distributions may not be able to install all of the required packages due to missing package availability, such as openssl-1.0.

Other information

API

Technical specs	Supported	Notes
Direct3D	9
OpenGL	2.0

Executable	32-bit	64-bit	Notes
Windows
macOS (OS X)			64-bit only since 1.08 (A)
Linux

Middleware

	Middleware	Notes
Audio	OpenAL Soft

Undertale Genocide Remover

A utility that automatically removes the permanent effects of a Genocide (or No Mercy) Route.

Details and download links are available through the author's site (archived)

Unitale

A Lua-moddable Undertale-based engine that allows for custom content to be created with the game's artistic style and gameplay.

Further details can be found on the engine subreddit.

System requirements

Windows

macOS (OS X)

Linux

Windows
	Minimum	Recommended
Operating system (OS)	XP, Vista, 7, 8, 10
Processor (CPU)		2 GHz
System memory (RAM)	2 GB	3 GB
Hard disk drive (HDD)	200 MB
Video card (GPU)	128 MB of VRAM	512 MB of VRAM

Linux
	Minimum	Recommended
Operating system (OS)	Ubuntu 14.04 or Linux Mint 17.3 are recommended
Processor (CPU)
System memory (RAM)	2 GB	4 GB
Hard disk drive (HDD)	200 MB

macOS (OS X)
	Minimum
Operating system (OS)
Processor (CPU)
System memory (RAM)	2 GB
Hard disk drive (HDD)	200 MB