# Online Multiplayer

Delta uses community-hosted Nintendo WFC servers to connect you with other players. Follow the instructions below to start using online features in games like Mario Kart, Pokémon, and more!

## How to Connect

{% hint style="success" %}
You will only need to perform these steps the first time you connect online.
{% endhint %}

1. Attempt to use online features in a Nintendo WFC-compatible DS game.
2. Tap "Choose Server" on the alert that appears.
3. Choose a server from the list or provide a custom DNS. 

{% hint style="warning" %}
You can change your server later by going to Delta Settings > Core Settings (Nintendo DS) > WFC Server, but you may need to re-register your friend codes.
{% endhint %}

4. Tap "Done" in the top right.
5. Restart your game by pressing "Restart" on the alert that appears.
6. If you are using BIOS Files, you'll need to erase your Nintendo WFC Configuration in-game
   1. Access the Nintendo WFC settings of the game. This is dependent on the game, but can usually be found from the game's main menu.
   2. Go to **Options,** then tap  "Erase Nintendo WFC Configuration" 

## Troubleshooting

1. Devices on the same Wi-Fi network may not be able to connect to each other. We recommend switching to cellular data (if available) as a workaround.
2. Make sure you have chosen a server in Delta Settings > Core Settings (Nintendo DS) > WFC Server.
3. If you're using a VPN or proxy, make sure to disable them. Otherwise you may be temporarily banned from using servers like Wiimmfi.
4. Try erasing your Nintendo WFC Configuration in-game
   1. Access the Nintendo WFC settings of the game. This is dependent on the game, but can usually be found from the game's main menu.
   2. Go to **Options,** then tap  "Erase Nintendo WFC Configuration" 
5. Consider deleting your BIOS files by going to iOS Settings → Storage → Delta, then deleting `bios7.bin`, `bios9.bin`, and `firmware.bin`.  

{% hint style="warning" %}
Removing BIOS files will prevent you from using the DS Homescreen and dual-slot functionality for GBA games.
{% endhint %}

## WFC Error Codes

{% hint style="info" %}
If you don't see your error code here or are still having issues after changing/resetting your network settings, you can search your exact code [here](https://wiimmfi.de/error) for additional troubleshooting tips.
{% endhint %}

<mark style="color:purple;">**20105 (Login Error)**</mark>

If you encounter this error, first try choosing a different WFC server in Delta Settings > Core Settings (Nintendo DS) > WFC Server. If you still have trouble connecting, try using an alternative WiFi network/cellular.

<mark style="color:purple;">**20110 (ISP Issue)**</mark>

If you encounter this error, first try choosing a different WFC server in Delta Settings > Core Settings (Nintendo DS) > WFC Server. If you still have trouble connecting, try using an alternative WiFi network/cellular.

<mark style="color:purple;">**23917 (Banned)**</mark>

If you see this error, you may need to erase your Nintendo WFC Configuration in-game. You will need to find the Nintendo Wi-Fi Connection Setup page for your game and then go to Options > Erase Nintendo WFC Configuration.

<mark style="color:purple;">**50199 (Connection Interrupted)**</mark>

Try checking your connection stability, using another WiFi Network, or switching to cellular.

<mark style="color:purple;">**51099 (Connection Error)**</mark>

If you see this error, you may need to go to your Core Settings > Nintendo DS  and reset your Online Settings before connecting again.

<mark style="color:purple;">**52000 (No Connection Found)**</mark>

You may need to try another WiFi/Cellular network or reset your router.

<mark style="color:purple;">**52100 (DNS Error)**</mark>

You will see this error if your DNS settings are incorrect. If you are using a custom server, check that you have entered the correct DNS settings.

<mark style="color:purple;">**52200 (Connection Error)**</mark>

If you encounter this error, first try choosing a different WFC server in Delta Settings > Core Settings (Nintendo DS) > WFC Server. If you still have trouble connecting, try using an alternative WiFi network/cellular.

<mark style="color:purple;">**60000 (Switched Servers)**</mark>

You will see this error if you switch servers while connecting to Nintendo WFC. You should restart your game and try again.

<mark style="color:purple;">**61020 (Maintenance Error)**</mark>

You will see this error if the server you are connecting to is under maintenance. You can try connecting to another server or trying again later.

<mark style="color:purple;">**80430 (Same WiFi)**</mark>

You may encounter this error if using the same WiFi with multiple devices. Try connecting each device to a different WiFi network/cellular.

<mark style="color:purple;">**81010 (Disconnected)**</mark>

Due to an unknown error, you were disconnected from Nintendo WFC and should try again.

<mark style="color:purple;">**86420 (DNS Error)**</mark>

This may be due to an unexpected error with the WiFi you are attempting to connect to. Try using an alternate WiFi network/cellular or resetting your router.

<mark style="color:purple;">**91010 (Banned Firmware/Kicked from Server)**</mark>

You were kicked from the server or your DS Firmware is banned on the server you are connected to. You can try again, use alternate BIOS files, or connect to a new server.