Nucleuscoop Keyboard Not Working - Causes, Fixes & User Guide!

If your keyboard isn’t working with NucleusCoop, it’s likely due to script issues, permission settings, or input conflicts. Updating the software, running as admin, and proper input assignment can usually fix it.

NucleusCoop is a popular tool for local split-screen multiplayer gaming on PC. It allows multiple instances of a game to run simultaneously, giving each player their own controller or keyboard and mouse. But what happens when your keyboard stops working in NucleusCoop? It’s frustrating—and can completely ruin your gaming setup.

In this article, we’ll explore the common causes behind the “NucleusCoop keyboard not working” issue and provide step-by-step solutions to help you fix it.

Table of Contents

What Is NucleusCoop?

NucleusCoop is an open-source software that allows PC gamers to play local co-op games using multiple input devices. It works by launching separate game instances and assigning each one a different control setup, including controllers or keyboard/mouse combinations.

It supports games like:

Borderlands series
Call of Duty: Black Ops
LEGO games
Left 4 Dead
Castle Crashers

Despite its popularity, users occasionally encounter issues—especially when using keyboards.

Common Keyboard Problems with NucleusCoop

When using NucleusCoop, users have reported a few keyboard-related problems:

1. Only One Keyboard Input Works

In some cases, only the first instance of the game detects keyboard input, and the second player can’t use their keyboard.

2. No Keyboard Input at All

NucleusCoop fails to detect any keyboard input for any player.

3. Keys Not Mapping Correctly

Keys are mapped incorrectly, or actions are triggered by the wrong keystrokes.

4. Keyboard Input Delay or Lag

Even when the keyboard is detected, the response is delayed, making gameplay difficult.

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Why Is Your Keyboard Not Working in NucleusCoop?

There can be several causes for keyboard issues in NucleusCoop:

🔧 Input API Conflicts

Games may rely on Raw Input, DirectInput, or XInput APIs. If NucleusCoop is not handling the game’s input method properly, your keyboard won’t work.

🔧 Anti-Cheat Restrictions

Some games have anti-cheat systems that restrict multiple input sources to prevent cheating. These may block keyboard access.

🔧 Windows Permissions

Running NucleusCoop or the game without administrator privileges may block access to devices like keyboards.

🔧 Incompatible Game Scripts

NucleusCoop uses custom scripts for each game. If the script is outdated or incompatible, keyboard input may not register properly.

🔧 Background Software Conflict

Other applications like keyboard remappers, overlays, or antivirus software may interfere with input signals.

How to Fix NucleusCoop Keyboard Not Working (Step-by-Step)?

Here’s a full guide to help you troubleshoot and fix the issue:

1. Run NucleusCoop as Administrator

Right-click on NucleusCoop.exe
Click Run as administrator

Running as admin ensures the software has full access to input devices.

2. Use the Latest Version of NucleusCoop

Visit the official GitHub repository and download the latest stable release. Older versions may have bugs or unsupported scripts.

3. Check the Game Script

Every game in NucleusCoop uses a custom script. If you’re facing issues:

Go to the Scripts folder in NucleusCoop.
Search for your game script.
Open the README file and check for notes about keyboard support.
Try downloading an updated script from the community if available.

4. Assign Keyboard & Mouse Properly

You need to correctly assign the input devices for each player:

Launch NucleusCoop.
Select your game.
Click “Add Player” and assign keyboard/mouse or controller to each.
Ensure that only one player uses the keyboard/mouse, and others use controllers. NucleusCoop doesn’t support multiple keyboards by default for all games.

5. Enable Keyboard Splitting (Advanced Method)

For advanced users, enabling keyboard splitting can help:

Use tools like UCR (Universal Control Remapper) or Interception Driver to split keyboard input between players.
Be cautious—this can be technical and may conflict with anti-cheat mechanisms.

6. Disable Background Keyboard Tools

Some users install keyboard mappers like:

AutoHotKey
SharpKeys
KeyTweak

Temporarily disable these and try again.

7. Test on a Different Game

Try running another game with NucleusCoop to see if the issue is game-specific or a general input problem. If it works elsewhere, the problem is likely with the game script.

Game Compatibility and Keyboard Support

Here’s how some popular games behave in NucleusCoop regarding keyboard support:

Game	Keyboard Support	Notes
Left 4 Dead 2	Yes	Only one keyboard instance supported
Borderlands 2	Limited	Works better with controller splits
Castle Crashers	Yes	Keyboard & controller mix works fine
Call of Duty	No	Controller-only recommended
LEGO Games	Partial	Often needs script tweaking

Best Practices to Avoid Keyboard Issues in NucleusCoop

Always assign only one player per keyboard unless using advanced tools.
Keep NucleusCoop and scripts up to date.
Avoid running overlays like Discord, NVIDIA ShadowPlay, etc. during co-op.
Temporarily disable antivirus/firewall if they block input access.
Use wired keyboards where possible to avoid Bluetooth lag.

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When to Seek Help from the Community

If you’ve tried all the above and the problem persists:

Visit the NucleusCoop Discord for community support.
Report the issue on GitHub with:
- Game name
- Version used
- Script info
- Description of the problem

The community is active and often provides quick fixes or updated scripts.

Alternative Tools If Keyboard Still Doesn’t Work

If you cannot resolve the issue with NucleusCoop, you may explore alternatives:

Parsec: For online/remote co-op (controller-focused)
Steam Remote Play Together: Easy for controller games
Aster Multiseat: For multiple user sessions on one PC (paid)

These don’t offer full keyboard splitting but can be useful for simpler setups.

FAQs:

1: Can NucleusCoop support multiple keyboards at the same time?

NucleusCoop doesn’t natively support multiple keyboards for different players. You can use advanced tools like UCR or Interception Driver for keyboard splitting, but it requires technical setup and may cause conflicts.

2: Why is only one player’s keyboard working in NucleusCoop?

Most games only recognize one keyboard input. NucleusCoop assigns one keyboard to the first player by default, so others must use controllers unless advanced input splitting tools are configured properly.

3: Does every game script support keyboard input in NucleusCoop?

No, keyboard support depends on the game and its NucleusCoop script. Some games support full keyboard input, while others require controllers or have limited compatibility due to how they handle inputs.

4: How do I assign keyboard and mouse correctly in NucleusCoop?

Launch NucleusCoop, add players, and assign the keyboard/mouse to just one player. Other players should use controllers to avoid input conflict. Ensure all instances are launched with administrator privileges.

5: Can antivirus or overlays affect NucleusCoop keyboard input?

Yes, software like antivirus programs, keyboard mappers, or overlays (e.g., Discord, NVIDIA) can interfere with input detection. Disable unnecessary background apps temporarily to test if they are causing input issues.

Conclusion:

Keyboard issues in NucleusCoop are common but often solvable with the right steps. Running the app as administrator, checking for updated scripts, and assigning inputs correctly are key fixes. While most games allow only one keyboard input, advanced users can try splitting tools for expanded control. Always test your setup before gameplay and engage with the community if problems persist. With some patience and configuration, you can enjoy smooth split-screen gaming using NucleusCoop and your keyboard setup.

Nucleuscoop Keyboard Not Working – Causes, Fixes & User Guide!