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Wiki/wiki-rtd/docs/wiki_emulator_guides/cemu/cemu-guide.md
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Cemu - General Guide

Cemu is a Wii U emulator that is able to run most Wii U games and homebrew.

Cemu Links:

Cemu Compatibility Guide

Cemu Wiki

Cemu Github

Cemu Webpage

Where to put the games?

WiiU games should be put under the retrodeck/roms/wiiu/ directory.

What file formats are supported?

File Format Description
.wud Encrypted Wii U disc image
.wux Compressed Wii U disc image
.wua Decrypted Wii U disc image (Recommended)
.rpx Wii U executable file

Does Cemu require BIOS or Firmware?

Yes, keys.txt if the file format is encrypted.

otp.bin and seeprom.bin if you want to play Online.

Where to put the BIOS / Firmware files?

~/.var/app/net.retrodeck.retrodeck/data/Cemu

This will be changed in a later update to the retrodeck/bios/cemu folder.

Folder structure

Type Folder Comment
ROMs Folder retrodeck/roms/wiiu/
Saves Folder retrodeck/saves/wiiu/cemu/
Config Folder ~/.var/app/net.retrodeck.retrodeck/config/Cemu/ settings.xml, gameProfiles folder, controllerProfiles folder
BIOS Folder retrodeck/bios/Cemu Contains usr and sys folders
Data Folder ~/.var/app/org.retrodeck.retrodeck/data/Cemu

Guide - How to install DLC and Updates

NOTE:

Do not keep DLC and Update files in: retrodeck/roms/wiiu/

Instructions:

  1. Open the Configurator and Open Cemu
  2. Press File -> Install game title, update, or DLC...
  3. Navigate to where you have your files.
  4. Choose the DLC or Update file and press Open and it will install.
  5. Repeat for each DLC / Update you want to install.

Guide - How make .wua files and install the games

NOTE:

  • Encrypted ROMs can't be converted to .wua.
  • Before you make the .wua install any updates or DLC first to the base game.

Instructions:

  1. Open the Configurator and Open Cemu
  2. Press Tools -> Title Manager
  3. Search for the game you want to convert and check so the Type colum says: base.
  4. Right click and press the Convert to compressed Wii U archive.
  5. Verify in the prompt that everything you want is there: base game, updates and DLC.
  6. Select the output target folder: retrodeck/roms/wiiu/.

Pretendo Account for online play

To create a Pretendo Network account.

  1. Use the provided link to register:

Pretendo: Register Account.

  1. Then, follow the instructions to log in with your Pretendo Network account on a Wii U.

Pretendo: Install WiiU

  • Note: Existing NNIDs are not usable on Pretendo Network, so you must create a Pretendo account.
  1. Follow the guide to generate and dump the required user files for your Pretendo Account:

Cemu: Online Play Guide

RetroDECK specific file locations:

  • Wii U User Account’s usr and sys folders

    • Located in the MLC Path configured in RetroDECK Configurator -> Open Cemu -> Options -> General settings (default: retrodeck/bios/cemu)

  • otp.bin and seeprom.bin:

    • Located at ~/.var/app/org.retrodeck.retrodeck/data/Cemu.

Known issues

Certain UI elements of emulators GUI are cramped / outside of the screen on the Steam Deck

Check the following link for Certain UI elements of emulators GUI are cramped / outside of the screen:

Known Issues