How do I put a mod on Undertale?

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You wish spice up your adventure on Undertale ? Mods can be a solution!

N’oubliez pas qu’il est possible de put Undertale in French.

Qu’il s’agisse de modifier le gameplay ou d’ajouter un mode multijoueur, je vous explique how to install a mod on Undertale and where to find them.

Tip: Je vous conseille de conserver une copie du fichier “data.win” d’origine avant de modder Undertale. En utilisant une copie propre, vous pourrez facilement mettre à jour le mod et le supprimer du jeu sans avoir à réinstaller quoi que ce soit.

1. Install Delta patcher

Mods are add-ons that allow you to modifier les dialogues, le gameplay ou encore les textures d’un jeu.

Please note that some mods for Undertale use l’extension de fichier “.xdelta” et vous aurez besoin d’installer le logiciel suivant : Delta Patcher.

Note: Delta Patcher's appearance may differ depending on your operating system.
Note : L’apparence de Delta Patcher peut être différente en fonction de votre système d’exploitation. ©️ Karen pour Alucare.fr

Remark : Some mods already have Delta Patcher built in. For others, you'll need to install Delta Patcher as mentioned above.

2. Installing a mod for Undertale

By using mods on Undertale, you can make the game more interesting même après l’avoir terminé.

Follow these steps to put a mod on Undertale :

  1. Localisez le fichier “data.win” of the game via Steam.
    • Go to your Steam Library.
    • Make a right click on Undertale.
    • Click on “Gérer” puis “Parcourir les fichiers locaux”.
    • Une fois que vous avez localisé “data.win”, set this window aside.
Use Steam to find the location of Undertale's "data.win" file more easily.
Passez par Steam pour trouver l’emplacement du fichier “data.win” d’Undertale plus facilement. ©️ Karen pour Alucare.fr
  1. Launch Delta Patch.
  2. Dans “Original File“, sélectionnez “data.win” in your Undertale folder.
  3. Pour “xDelta patch“, il suffit de choisir le mod Undertale avec l’extension “.xdelta”.
  4. To finish, cliquez sur “Apply patch” to modder Undertale.

By following these steps correctly, your game Undertale is modded.

Remark : Si votre mod n’est pas un fichier “.xdelta”, mais un fichier de données, il sera plus facile à installer. Pour se faire, il suffit de replacer le fichier “data.win” dans le dossier Undertale par celui du mod.

3. Find mods for Undertale

Now that you know how to put mods on Undertale, it's important to know where to put them. take mods without risk for your game.

Screenshot showing GameBanana's home page for mods on Undertale.
Capture d’écran montrant la page d’accueil de GameBanana pour les mods sur Undertale. ©️ Karen pour Alucare.fr

Among the possibilities, GameBanana is one of the most popular sites for downloading Undertale mods.

Pour installer des mods sûrs, nous vous recommandons d’install those with the most :

  • Of comments,
  • D'evaluations,
  • Of downloads,
  • etc

Plus one mod Undertale is highlighted by players, moins il y a de chance qu’il s’agisse d’un virus.

Is there a mod multiplayer on Undertale?

Yes, it is quite multiple players possible on Undertale, à condition d’installer le mod adéquat.

The best known is the mod Undertale Together for 2 players.

Remark : This mod multiplayer for Undertale only works if you have purchased the game on PC and Xbox.

Here are the steps to follow install mod Undertale Together on PC :

  1. Download Undertale Together.
  2. After extracting the file, do a double-click on SpaghettiInstaller.exe.
Note: This multiplayer mod only works if you have purchased Undertale.
Note: This multiplayer mod only works if you have purchased Undertale. ©️ Karen for Alucare.fr
  1. Then follow the déroulement de l’installation.
Be sure to deactivate your antivirus software while the mod is being installed.
Veillez à désactiver votre antivirus le temps de l’installation du mod. ©️ Karen pour Alucare.fr
  1. At the time of choisir le dossier d’installation, l’application détectera automatiquement Undertale sur Steam sur votre PC.
Simply click on "Yes" to confirm the installation of mod Undertale Together.
Il suffit de cliquer sur “Oui” pour confirmer l’installation du mod Undertale Together. ©️ Karen pour Alucare.fr
  1. Then check that the mod multiplayer on Undertale by launching the game.
If you have followed the installation steps correctly, Undertale Together should appear on your screen.
Si vous avez correctement suivi les étapes d’installation, Undertale Together devrait s’afficher à l’écran. ©️ Karen pour Alucare.fr

Now you know how to put a mod on Undertale and where to find one in complete safety! You'll also know how to play with two players, thanks to the multiplayer mod.

You can also consult our complete guide to boss si vous avez besoin d’aide pour les affronter.

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Undertale

Released on : September 15, 2015

Developed by : Toby Fox

Edited by : Toby Fox

Available on : PC, Mac, Linux, PlayStation, Switch

Genres : RPG, Action