> For the complete documentation index, see [llms.txt](https://docs.coherence.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.coherence.io/1.2.4/getting-started/setup-a-project/local-development.md).

# 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](/1.2.4/manual/replication-server.md) 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*

<img src="https://content.gitbook.com/content/fo6vUwbCyyb7fmwjPG0A/blobs/RZz0z1qf60TG8fgzc0FJ/LaunchRS.png" alt="" width="375">

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:

<img src="https://content.gitbook.com/content/fo6vUwbCyyb7fmwjPG0A/blobs/LIwWDvBioJo88Bwp7Ty6/Hub_RS.png" alt="" width="375">

{% hint style="info" %}
Whether you run a Replication Server for Rooms or for Worlds depends on [which setup you plan to use](/1.2.4/manual/replication-server/rooms-and-worlds.md), which in turn requires the correct corresponding [Sample UI](/1.2.4/getting-started/setup-a-project/samples-connection-uis.md).
{% endhint %}

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

<img src="https://content.gitbook.com/content/fo6vUwbCyyb7fmwjPG0A/blobs/7YId0SyY9zETa7ZoZM75/RS.png" alt="The Replication Server runnning in the terminal" width="375">

{% 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://2047761709-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ffo6vUwbCyyb7fmwjPG0A%2Fuploads%2FdMYl4y6CyhgvKh5i8O1U%2FChef.png?alt=media&amp;token=9a54b17b-e080-4e2f-9010-a1060a89bbda" alt="" data-size="original"><img src="https://2047761709-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2Ffo6vUwbCyyb7fmwjPG0A%2Fuploads%2F0azr01y22cgjKVbU0NMi%2FBake.png?alt=media&amp;token=320194e8-fcdc-4c15-9131-589a54c52c8e" alt="" data-size="original">\
\
Time to bake!
{% endhint %}

## Testing the Game

* [Using Player Builds](/1.2.4/getting-started/setup-a-project/local-development/local-testing-using-builds.md)
* [Using MPPM](/1.2.4/getting-started/setup-a-project/local-development/multiplayer-play-mode.md)
* [Using ParrelSync](/1.2.4/getting-started/setup-a-project/local-development/local-testing-via-parrelsync.md)