Digimon Universe: Appli Monsters (3DS)
English Fan Translation v1.0

Appmon Chip... ready! The wait is over!

We're proud to present the final result of the endeavor to bring Digimon Universe: Appli Monsters (the 3DS game) to English-speaking audiences. The project began in late May 2025 and was finished in just under a year, in May 2026. The game is fully translated and can be played in English from start to finish on a modded 3DS console or an emulator. Huge thanks to everyone who helped bring this to completion, as well as to everyone who followed it from beginning to end!

Download Patch v1.0 from GitHub Join the Discord Server

A copy of this page is included in the download.
See sections below for patching instructions and additional info.
Be sure to read the "Before Patching" and "Patching" sections.

Screenshots

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• 2026.05.15 — Version 1.0
  The initial release. Yay!

Your first order of business is to obtain the decrypted original ROM of the game.

The authors of the fan translation will not provide it, nor will they offer any help with dumping and decrypting 3DS ROMs. This step is entirely up to you. Please use the internet for help if necessary, it has plenty of relevant information. Do not share, request or discuss illegal downloads in any spaces related to the fan translation, or, better yet, anywhere at all.

The patch expects a decrypted copy of the Digimon Universe: Appli Monsters ROM.
(The full version, not the free demo subtitled Cyber Arena.)

• File size: 1.0 GiB
• SHA-1 hash: 5743d3f357d05d97124773618d5b6dde3c5e85b2
• CRC-32 hash: E444CA2F

Please pay attention to this information. If you don't know how to calculate the hash of a file, look it up and be sure to verify your decrypted ROM against one of the hashes stated above (no need to check both, if one corresponds, the other will too).

Other ROM variants are not supported. Issues caused by using them won't be addressed. Keep in mind that the patcher script may accept some incorrect ROMs and then produce a broken result, so make sure you provide a correct copy.

You can mark the steps you've completed with checkboxes to keep track of your progress.
This is purely for your convenience. Reset all checkboxes

• Step 1: Create an empty folder anywhere on your computer. We'll refer to it as "work folder".
• Step 2: Extract the contents of the downloaded appmon_en_patch_v1.0.zip archive into the work folder.
• Step 3: Also place your decrypted original ROM in the work folder and rename it (the ROM) to appmon.3ds.
• Step 4 (choose one that's relevant for you):
  • If you're using Windows, double-click appmon_patcher_windows.bat in the work folder.
  • If you're using Linux, open your terminal in the work folder (or cd to it) and run:
    chmod +x ./appmon_patcher_linux.sh; ./appmon_patcher_linux.sh.
  • If you're using macOS, open your terminal in the work folder (or cd to it) and run:
    chmod +x ./appmon_patcher_macos.sh; ./appmon_patcher_macos.sh.
• Step 5: Read the text in the console window carefully and press Enter when ready to start.

When the patching process finishes, you'll have two patched ROM variants in the work folder.
Expect both of them to be about half the size of the original ROM due to removal of padding.

• appmon_en_v1.0_console.cia is for installing and playing on a modded 3DS.
• appmon_en_v1.0_emulator.cci is for playing on an emulator.

Grab the one you need and install it on your modded 3DS, or launch it using an emulator. Enjoy the game in English!

This is a very generic how-to, but it should point you in the right direction.

You can mark the steps you've completed with checkboxes to keep track of your progress.
This is purely for your convenience. Reset all checkboxes

• Step 1: Create an empty folder anywhere on your device. We'll refer to it as "work folder".
• Step 2: Extract the contents of the downloaded appmon_en_patch_v1.0.zip archive into the work folder.
• Step 3: Also place your decrypted original ROM in the work folder and rename it (the ROM) to appmon.3ds for simplicity.
• Step 4: Look for an xdelta3 patcher app and install it. Alternatively, look for a browser-based tool.
• Step 5: In your xdelta3 patcher of choice, select the appmon.3ds ROM from the work folder as the source file.
• Step 6: Then select one of the following files from the work folder as the patch file:
• appmon_patch/appmon_en_v1.0_console.vcdiff if you intend to play on a modded 3DS console.
• appmon_patch/appmon_en_v1.0_emulator.vcdiff if you intend to play on an emulator.
• Step 7: Apply the patch in your xdelta3 patcher.

Your patcher of choice should produce the patched ROM for you.
Expect it to be about half the size of the original ROM due to removal of padding.

Install it on your modded 3DS, or launch it using an emulator, depending on which variant you chose. Enjoy the game in English!

For the most part, everything in the patched game works perfectly fine. However, there are some minor unresolved issues that don't disrupt gameplay. Here's a list of them.

• In local multiplayer battles, player names longer than 6 characters may be visually truncated to 6 characters. For example, the name Benjamin will be displayed as Benjam. This only occurs in the room creation/selection interface and during the following local multiplayer battles. The issue is purely visual and temporary, and it doesn't affect anything. Attempts to patch this limitation caused battles to desynchronize after the first turn, so the decision was made to leave it alone, at least for now.
• The font of the "live chat messages" floating across the screen in Cyber Arena battles (overlayed on top of the action to simulate Niconico-style "danmaku comments") is slightly stretched horizontally compared to the rest of the text in the game. This will probably go competely unnoticed by most players, but the visual inconsistency is there. Changing it is non-trivial, so for now it has been left as is.
• Near the beginning of the game, when you're taught how to convert Appmon fragments for the first time, the tutorial highlight prompting you to select Tellermon fragments is slightly misaligned in size due to the menu being widened compared to the Japanese version. The highlight size isn't defined in a straightforward way, and fixing this minor issue would've required a significant amount of tinkering for something that's only visible for a few seconds and never seen again. Most players probably won't even notice that anything is off.
• (A theoretical issue.) Since support for all of this game's internet battle features ended long ago, there's currently no way to access any of the interfaces related to them. As a result, the translation of these parts had to be done "blindly", by translating text and textures without being able to see how everything actually comes together in-game. This means that if a service such as Pretendo ever adds support for this game in the future (unlikely, but not completely out of the question), and those features become accessible again, some of their visual elements may appear broken. But until that happens, if it ever does, there's no way to tell.

• Main Translation: Geo
• Graphics Editing: Geo
• Programming: Geo, Romsstar
• Text Editing: Geo, birdboy2000
• Additional Translation: Fat Cat
• Title Logo Adaptation: LouLilie
• Testing: Geo, birdboy2000, Ren D., Lys T.

As an added bonus, the patch archive also contains a large collection of QR codes for the game, compiled from many different sources and optimized for use on emulators, while also being fully suitable for scanning with a real 3DS console's camera. The codes allow you to obtain any Appmon at any time, as well as receive some bonus items. Be careful, though, as it's very easy to trivialize the game for yourself this way.

You can find these QR codes in the appmon_qr folder.

Special thanks to ChefKyroo from the project's Discord server for scanning their entire Appmon Chip collection and sharing the scans with everyone.

Credits for other sources: Long's Toys, Digimon Malmutt, KRX50, rustmarrow, Diary Channel, 神クレア/シレン, Vtoy Studio, Coca TOY TV | おもちゃレビュー, Lost in Translationmon, DarkDjango, zenihappy_gyou, Axel97, Wikimon.

Please feel free to join the project's Discord server to meet other Appmon fans and discuss the game and the fan translation, or anything else related to Appmon or Digimon in general.

Server invite link: discord.gg/G7mhtHYhyF