You need Unity 2019.4.26 to mod Risk of Rain 2! Go to Unity's download archive to download it.

In order to start working on custom hands, you will need to:

1. Create a 3D Unity project with version 2019.4.26f1
2. Install ThunderKit into your project
3. Install the Asset Bundle Browser
4. Import the VR devkit package

Create your project

In Unity Hub, click on the arrow next to the "New" button and select 2019.4.26f1.

Give your project a name and a location. Make sure to select the 3D template, then press the "Create" button.

Install ThunderKit into your project

ThunderKit is required in order to access some of the game's scripts.

Visit the ThunderKit GitHub and follow the steps for initial setup to load the dependency and locate your game. No extra step with ThunderKit is needed at this point. If you wish to know more about ThunderKit and it's features, you can continue reading their GitHub page or follow the ThunderKit tutorial.

Install the Asset Bundle Browser

ThunderKit allows you to create asset bundles for your mod. If you don't want to dive into its functionalities, there is a simple alternative called the "Asset Bundle Browser".

To install the browser, open the package manager with Window > Package Manager. Find the "Asset Bundle Browser" and install the package.

Import the VR devkit package

The devkit package contains necessary scripts and examples to help you work on your custom hands.

Download the latest devkit package here and open it to import its content into your project.

Next step: Basic essentials for custom hands