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Project64-MPN Troubleshooting

This guide covers common issues you might encounter while setting up or playing Mario Party 1-3 netplay with Project64-MPN.

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Frequently Asked Questions

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Q: I already have PJ64, do I need to download it again?

A: Yes. This guide provides a version of the emulator geared specifically for netplay, and it’s incompatible with other versions.

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Q: How can I reduce netplay lag?

Solutions:
  • Increase lag using /lag x command
  • Close any other programs using internet (web browsers, Skype, etc.)
  • Make sure no one on the same network is using the internet (family, roommates)
  • Seek out other users with nearby region tags
  • Ensure it’s actually netplay lag by having each player test FPS locally
About Lag/Buffer:
  • Lag/Buffer refers to the amount of frames of input delay
  • The larger it is, the more smoothly the game will run (provided all players can run the game fine offline)
  • You can set it mid-game using /lag x
  • Always set it to the lowest value that gives you a smooth framerate to reduce unnecessary input delay

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Q: The game’s graphics are bad! Can I make them look better?

A: The resolution and anti-aliasing of a game can be changed without issue, though it’s not recommended as the emulation will require more resources. If you want to edit these options, load a splitscreen Mini-Game such as MP2’s Shell Shocked offline and confirm the game speed does not decrease.

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Q: What Video Plugin should I use?

A:
  • GLideN64 for Windows
  • Jabo’s if you have trouble with GLideN64
  • Rice for macOS

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Connection Issues

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Can’t connect to traversal server

Problem: Unable to connect to play64.com servers. Solutions:
  • Try different server regions (new-york.play64.com, etc.)
  • Use P2P connection instead
  • Check your firewall settings
  • Ensure your internet connection is stable

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P2P connection issues

Problem: Can’t connect via P2P or host P2P games. Solutions:
  • Ensure port forwarding is set up correctly (port 27886)
  • Check Windows Firewall settings for both TCP and UDP rules
  • Verify your public IP address is correct
  • Make sure your router supports UPnP or manual port forwarding

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Controller Issues

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Xbox controller not working properly

Problem: Xbox controller inputs not registering correctly. Solution:
  • Make sure the XInput option is checked in N-Rage Input Plugin V2: 2.3c’s configuration
  • Reconfigure your controller settings

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GameCube controller issues

Problem: Shoulder button issues or random inputs with GameCube controller. Solution:
  • Use the Direct-Input8 input plugin instead of the default
  • This is included as an option specifically for GameCube controller users

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Multiple controllers on same computer

Problem: Issues with multiple people playing from the same computer. Solutions:
  • Make sure everyone playing has only the controller they’re using plugged in
  • Configure each controller separately in the input plugin
  • Ensure the host allows multiple ports if needed

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Game Issues

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Save file conflicts

Problem: Save file mismatch warnings or corrupted saves. Solutions:
  • Every player must have the same save file for saving to work
  • Always say Y when prompted unless you are mid-game
  • Select Replace Save Files from the emulator’s Netplay tab before every party
  • Download fresh save files if corruption occurs

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Desync or crashing

Problem: Game desyncs or crashes during netplay. Solutions:
  • Use /map 1:<controller_port> to change controller ports
  • Restart the netplay session
  • Ensure all players have the same ROM versions
  • Check that everyone’s settings match

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Black screen on game window

Problem: Game window shows black screen. Solution: This is normal behavior - use the pop-up netplay window to control the game.

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Performance Issues

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Poor graphics performance

Problem: Game runs slowly or graphics are poor. Solutions:
  • Try different video plugins (GLideN64 recommended for Windows)
  • Lower resolution and anti-aliasing settings
  • Close other programs using system resources
  • Test performance offline first

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Input lag

Problem: Excessive input delay during gameplay. Solutions:
  • Adjust lag settings using /lag x command
  • Disable autolag if needed
  • Check network connection quality
  • Ensure all players have good local performance

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Getting More Help

If you’re still having issues:
  1. Check our Discord server for community support
  2. Visit our GitHub repository for updates and bug reports
  3. Make sure you’re using the latest version of Project64-MPN
  4. Check the #news channel in Discord for updates about new features