First you need to run the game once. You can do this without this step, but it sets up a bunch of folders for you.

The folder you are looking for is:

If for some reason you can't type this into your file browser press Ctrl + H to see the folder .mono in your default home folder, then navigate to the proper folder. You don't have to worry about sudo or root permissions either, as you own this folder and already have permission to write files to it.

In most Linux distros you should be able to right click and do something like Create Document > Empty File. For the file name you want "values.xml" without the quotes. Now open the file in a text editor like gedit, mousepad, vi, nano, etc. and paste this into the file:


Then save your file. You can now open up Terraria and you will be given the carrot item on any new character you create. Have fun with your pet bunny!

Since the inception of this guide 9+ years ago, Valve has released Proton. Changing the key in proton is far more similar to Windows than it is with the native Linux version. A few prerequisites are need for doing this though:

1. You must manually set the game to use a specific version of Proton (Experimental or a custom installed version of Proton-GE is recommended) and you must run the game once
   
2. You must have protontricks installed
   
3. You must know where your game is installed with Steam

After you run the game and close it, run the following command:

You will get a window that looks a lot like the Windows regedit tool, this is what we want. Follow these steps:

1. Open the folder "HKEY_CURRENT_USER"
   
2. Go into the folder "Software"
   
3. Right click on the "Software" folder and go to "New" > "Key"
   
4. Name it "Terraria" (without the quotes)
   
5. Open the "Terraria" folder
   
6. Right click in the blank space below the word "(Default)" and go to "New" > "String Value"
   
7. Name this value "Bunny" (without the quotes)
   
8. Set the value to "1" (without the quotes)

Now you can launch the game and a new character you create should be given the bunny item.

Unfortunately it looks like Linux Native dotnet 8 doesn't have a way to simulate the Windows Registry at the time of writing this. If you want to use TModLoader on Linux and have the bunny you need to use Proton.

Follow all the steps of the above section but use this protontricks command instead:

Launch TModLoader and any new character created will have the pet bunny.