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Lambda is a free, open-source, Minecraft 1.12.2 utility mod providing a visionary system for plugins that allow customizing the clients features thanks to an ingame plugin store.

lambda-2.07.01.jar - July 1, 2021 - 12.0 Mb


How do I…

… open the ClickGUI?

Press Y

… execute a command?

Use the ingame chat with the prefix ;

… install plugins?

Open the lambda menu either on main menu or escape menu. You can download official plugins there. They are hosted on GitHub. If you want to load a third party plugin click the open plugins folder button and put the jar into the folder. CAUTION: Third party plugins can contain dangerous code! Only use plugins from trusted sources!

… export KAMI blue config to lambda?

Rename .minecraft/kamiblue to .minecraft/lambda

… fix most crashes on startup?

Possibly you have multiple mods loaded. Forge loads mods in alphabetical order, so you can change the name of the Mod jar to make it load earlier or later. Add for example an exclamation mark to lambda jar to make it load first.
If you got Error: java.lang.IllegalAccessError: tried to access field net.minecraft.util.math.Vec3i.field_177962_a from class baritone.k remove the noverify tag from your arguments.

… reset the ClickGUI scale?

Run the command ;set clickgui scale 100


Clone Repository

Clone the repository to your local machine. Use the link of either your fork or the main repository.

git clone

Run scripts/ to initialize the environment.
With terminal on Linux or Git Bash for Windows


Setup IDE

In this guide we will use IntelliJ IDEA as IDE.

  1. Open the project from File > Open...
  2. Let the IDE collect dependencies and index the code.
  3. Goto File > Project Structure... > SDKs and make sure an SDK for Java 8 is installed and selected, if not download
    it here

Gradle build

Test if the environment is set up correctly by building the client and run it inside IDE using the Gradle tab on the right side of the IDE.

  1. Go to lambda > Tasks > build > runClient in the Gradle tab and run the client or create a native run using lambda > Tasks > fg_runs > genIntelliJRuns.
  2. To build the client as a jar run lambda > Tasks > build > build. IntelliJ will create a new directory called build. The final built jar will be in build/libs

Thanks to

zeroeightysix for the original KAMI

KAMI Blue for the continuation of KAMI

ronmamo for Reflections

MinecraftForge for Forge

Our contributors




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