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    2,046,932 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 24 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 24 Oct 2026.269,480 projects gradedProjects with a letter from A to F. Counted on 24 Oct 2026.
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    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Undertale modded

    Mod

    Explore Undertale-inspired items, blocks, weapons, armor, food, and structures.

    C78/ 100
    • OverviewC
    • SecurityPassed
    • PrivacyNone found
    • AINone found
    • CompatibilityUp to 26.1.2
    • ModpacksIn 8
    • ReleasesLatest 4 Sep

    Download

    UndertaleMod-26.1.2-2.18.9.jar

    Released 4 Sep 2026 · 2.2 MB

    Passed: our checks found nothing harmful in this file.

    Download
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade C

    How grades work

    Strengths

    • Security checks passed
    • Around for years

    Points lost

    • No source code link−7 points
    • Releases replaced within 3 days to fix a problem−5 points
    • Releases in only 5 of the last 24 months−2 points
    • Under 5 million downloads−1 point
    All 11 criteria

    • Maintenance

      2 points lost25 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.7 weeks ago (4 Sep 2026) 12 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.26.1.2 on NeoForge, 1.20.1 on Forge. 15% or more of the popular mods updated in the last 6 months also have files for 26.1.2. Latest Minecraft: 26.3. 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 5 of the last 24 months 4 / 6

    • Stability

      5 points lost17 / 22
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.2 of the 6 modpacks with two or more versions removed it in a later one (33%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.4 of its 13 releases in 2 years needed a quick fix (31%) See the 4 releases2 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      7 points lost0 / 7
      Source codeWhether the project page links to its source code, so anyone can read what it does.No link on the project page 0 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.Does not apply. CurseForge links are not in our data.

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.39,094 3 / 4

    • Track record

      Full points8 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.4.5 years, 89 releases 8 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in all 3 latest files for recent Minecraft versions. See Security
    Total78 / 100

    52.7 of the 68 points that apply = 77.5, so 78 out of 100. The points above are rounded to whole numbers.

    Images

    • Blocks
    • Weapons/Tools
    • Food
    • Items
    • Slabs/stairs
    • Paintings
    • Armor sets
    • Villager Trades
    • Items.PNG
    • Food.PNG
    • Tools.PNG
    • Blocks.PNG
    • Armour.PNG
    • Wallpaper Blocks
    • Bricks/Ruin blocks
    • Snowdin/Hotland/True Lab/Waterfall/Core Blocks
    • Core Blocks
    • Waterfall Blocks
    • Underground Ruin
    • Structure

    About

    Undertale modded brings items, equipment, food, blocks, structures, paintings, advancements, and villager and wandering-trader trades inspired by Undertale into Minecraft, with flavor text on many additions. Its themed building content includes Snowdin, Hotland, True Lab, Waterfall, and Core blocks, along with wallpaper, ruins, bricks, slabs, stairs, and paintings; a small structure can spawn deep in deepslate, and underground ruins may conceal ore and other finds. The equipment includes recognizable weapons such as the True Knife, Chaos Saber, Rusty Kitchen Knife, and Spear of Justice, as well as armor sets and tools; weapons and souls have stats, and individual weapons have distinct effects, from the Tough Glove's staggered hits to the Burnt Pan's chance to heal when killing a mob. Soul abilities add further combat and utility mechanics: Kindness can consume hunger to heal nearby players, while the Integrity ability's ground slam deals damage instead of killing its user. Exploration and crafting additions include Allom ore and upgradeable Allom tools, plus a Calcified Magical Rock that chimes near magical materials such as lapis, gold, emeralds, amethyst, and Allom. Waterfall grass and glowshrooms provide harvestable seeds and edible mushrooms, while Mystic Seeds grow a randomly chosen crop from wheat, carrots, potatoes, beetroot, or glowshroom. The mod also adds a save-point block and item with audiovisual feedback, and a Save Item and block redesign styled after Undertale's save menu that displays the biome, time of day, and player level.

    Written from CurseForge . How we write it

    In-game changes

    Does not change the game's code directly.

    Adds 111 blocks, 141 items, 5 structures, 2 paintings, 210 recipes, 25 advancements, 3 loot tables, 9 sounds and 1 key binding.

    Counted from the names and data files in the mod, so the list may not be complete.

    Replaces 1 of vanilla Minecraft's loot tables.

    Details

    Creator
    nipabag
    License
    Not known
    Downloads
    39K
    Created
    19 Apr 2022
    Official page
    CurseForge

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · All 5 latest files checked, last on 16 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      5 latest files: the newest file for each Minecraft version and loader. The answer above is about the 3 for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Looked for, not foundWe looked for these in the file and did not find them.
      The internet, folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends

    We read its code without running it: it contacts no web address while you play.

    Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.

    How we checked · All 3 files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of all 3 files, for recent Minecraft versions. See each file in Releases

    AI

    No sign that AI was used to make it

    We looked for AI tools in its texts, files, images and sounds and found none.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 5 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      Not on Modrinth.
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      26 of 40 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
      427 images read
    • Sounds in its filesThe tags of the sound files in the files you download, where some AI music tools write their name.
      Nothing found
      9 sounds read
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      613 code files read

    Compatibility

    See all 89 files
    NeoForge
    Forge
    1.171.201.2126.1

    Point at or tap a version to see its loaders.

    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.Nothing
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.It has no file for Minecraft versions newer than 26.1.2. Many recently updated mods still support 26.1.2.

    Modpacks using this project

    Find modpacks with it

    Modpacks that include Undertale modded in at least one of their versions, most downloaded first.

    ModpackDownloadsLast version with it
    Under-Craft5.2K downloadslast version with it 22 Sep 2025Photographic Investigators4.4K downloadslast version with it 28 Apr 2025WorldStudios' WackyCraft474 downloadslast version with it 22 Jul 2025Fossils and Archeology Create Even More244 downloadslast version with it 10 Sep 2025Dragon's Maddness151 downloadslast version with it 12 Jul 2026All of Mcreator 3108 downloadslast version with it 3 Oct 2025TMF Cunk Pack58 downloadslast version with it 23 Jun 2022ArcadeCraft17 downloadslast version with it 7 Sep 2026

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftLoaderVersionSecuritySendsRequires
    26.1.2·NeoForge2.18.92.18.9 · UndertaleMod-26.1.2-2.18.9.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.4·NeoForge2.17.92.17.9 · UndertaleMod-1.21.4-2.17.9.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.20.1·Forge2.15.72.15.7 · UndertaleMod-1.20.1-2.15.7.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    Older Minecraft versions
    1.18.2·Forge1.48.121.48.12 · UndertaleMod-1.18.2-1.48.12.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.
    1.17.1·Forge1.20.21.20.2 · UndertaleMod-1.17.1-1.20.2.jarSends: None foundRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    89 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    26.1.2The latest file for its Minecraft version and loader·NeoForge2.18.92.18.9 · UndertaleMod-26.1.2-2.18.9.jar·4 Sep 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Stable · 2.2 MB
    1.21.4The latest file for its Minecraft version and loader·NeoForge2.17.92.17.9 · UndertaleMod-1.21.4-2.17.9.jar·31 Oct 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Stable · 1.5 MB
    1.21.4·NeoForge2.16.92.16.9 · UndertaleMod-1.21.4-2.16.9.jar·23 Jul 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.3 MB
    1.21.4·NeoForge1.16.81.16.8 · UndertaleMod-1.21.4-1.16.8.jar·20 Jul 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.3 MB
    1.21.4·NeoForge1.15.81.15.8 · UndertaleMod-1.21.4-1.15.8.jar·29 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.2 MB
    1.20.1The latest file for its Minecraft version and loader·Forge2.15.72.15.7 · UndertaleMod-1.20.1-2.15.7.jar·25 Mar 2025PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.15.62.15.6 · UndertaleMod-1.20.1-2.15.6.jar·24 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.14.62.14.6 · UndertaleMod-1.20.1-2.14.6.jar·8 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.13.62.13.6 · UndertaleMod-1.20.1-2.13.6.jar·7 Mar 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.12.62.12.6 · UndertaleMod-1.20.1-2.12.6.jar·15 Feb 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.12.52.12.5 · UndertaleMod-1.20.1-2.12.5.jar·15 Feb 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.1 MB
    1.20.1·Forge2.11.52.11.5 · UndertaleMod-1.20.1-2.11.5.jar·13 Feb 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.0 MB
    1.20.1·Forge2.10.52.10.5 · UndertaleMod-1.20.1-2.10.5.jar·12 Feb 2025PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 1.0 MB
    1.20.1·Forge2.9.52.9.5 · UndertaleMod-1.20.1-2.9.5.jar·1 Mar 2024PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 993.4 KB
    1.20.1·Forge2.8.52.8.5 · UndertaleMod-1.20.1-2.8.5.jar·16 Dec 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 897.1 KB
    1.20.1·Forge2.7.52.7.5 · UndertaleMod-1.20.1-2.7.5.jar·3 Dec 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 879.9 KB
    1.20.1·Forge2.6.52.6.5 · UndertaleMod-1.20.1-2.6.5.jar·28 Nov 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 866.7 KB
    1.20.1·Forge2.5.52.5.5 · UndertaleMod-1.20.1-2.5.5.jar·18 Nov 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 836.9 KB
    1.20.1·Forge2.4.52.4.5 · UndertaleMod-1.20.1-2.4.5.jar·15 Nov 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 832.1 KB
    1.20.1·Forge2.4.42.4.4 · UndertaleMod-1.20.1-2.4.4.jar·11 Nov 2023PassedOur checks found nothing harmful in this file.Open this file on CurseForgeDownload · Stable · 823.3 KB
    1 to 20 of 8912345

    Quick fixes

    In the last 2 years, 4 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 5 points.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.4

    • UndertaleMod-1.21.4-2.16.9.jar23 Jul 20251.21.4-2.16.9 Advancement Fixes -;Trash crafting; not giving advancment when having…
    • UndertaleMod-1.20.1-2.15.7.jar25 Mar 20251.20.1-2.15.7 [Bug Fixes for 2.15.6] -Fixes- [forgot to include part…
    • UndertaleMod-1.20.1-2.12.5.jar15 Feb 2025…to Where are the knives Fixes SnowdinShedBlock preferred tool is now axe…
    • UndertaleMod-1.20.1-2.11.5.jar13 Feb 2025…RuinFloorCracked. Fixed -Fixed Save icon and save block recipe giving you. an…