# Local development

Now we can build the project and try out network replication locally. This example will show you how to launch a local [Replication Server](https://docs.coherence.io/1.3/manual/replication-server) and connect multiple instances of the game to it.

## Running a Replication Server locally

You can run a local Replication Server from:

*coherence > Local Replication Server > Run for Rooms / Run for Worlds*

![](https://content.gitbook.com/content/NnpDkLUgRAbq6m09r93U/blobs/nFuGZ5D0T2qjug5NbPD0/LaunchRS.png)

As with most features found in the menu, you can find local Replication Server functionality in the *coherence Hub* as well.

Open the *Replication Servers* tab and run a Room or a World Replication Server:

![](https://content.gitbook.com/content/NnpDkLUgRAbq6m09r93U/blobs/VFZCWaeaqX83AyemfE4j/Hub_RS.png)

{% hint style="info" %}
Whether you run a Replication Server for Rooms or for Worlds depends on [which setup you plan to use](https://docs.coherence.io/1.3/manual/replication-server/rooms-and-worlds), which in turn requires the correct corresponding [Sample UI](https://docs.coherence.io/1.3/getting-started/setup-a-project/samples-connection-uis).
{% endhint %}

Regardless of how you launch it, a new terminal window will open and display the running Replication Server:

![The Replication Server runnning in the terminal](https://content.gitbook.com/content/NnpDkLUgRAbq6m09r93U/blobs/WkGIBUy5PKn58iHJfH5L/RS.png)

{% hint style="success" %}
Done! If the terminal opens correctly and you don't see an error line, it means your Replication Server is running! Now you should be able to connect in the game.
{% endhint %}

{% hint style="warning" %}
**If you can't connect**

Did you change something in the configuration of your connected Prefabs? You have to bake again, and restart the Replication Server.

You will notice it because there will be a little chef's hat next to the coherence folder, or a warning sign on Bake buttons.\
\ <img src="https://content.gitbook.com/content/NnpDkLUgRAbq6m09r93U/blobs/2mxGrPuKe0fcgcY83VYu/Chef.png" alt="" data-size="original"><img src="https://content.gitbook.com/content/NnpDkLUgRAbq6m09r93U/blobs/d4gMLU2AzhiJrvIsNeD6/Bake.png" alt="" data-size="original">\
\
Time to bake!
{% endhint %}

## Testing the Game

* [Using Player Builds](https://docs.coherence.io/1.3/getting-started/setup-a-project/local-development/local-testing-using-builds)
* [Using MPPM](https://docs.coherence.io/1.3/getting-started/setup-a-project/local-development/multiplayer-play-mode)
* [Using ParrelSync](https://docs.coherence.io/1.3/getting-started/setup-a-project/local-development/local-testing-via-parrelsync)