This will get you the Bunny pet that comes with the Collectors Edition of the game.
- Press the Windows key + R to bring up the Run dialog box.
- Type in regedit and press Enter. This will open the Registry Editor.
- Click Yes if prompted.
- On the left, navigate to HKEY_CURRENT_USER > Software > Terraria.
- At the top, click Edit -> New -> String value.
- Name the string as "Bunny" (without quotes) and press Enter.
- Double click on the "Bunny" text and you will be asked to enter a value.
- Type in 1 and click OK.
- Close the Registry Editor.
- Launch the game and get the carrot item via one of the following ways:
- New characters
- Create a new character.
- You will notice that you have a Carrot in your quick slots. Equip it and left click to spawn the Bunny.
- Existing Characters
- Create a new character.
- Place the Carrot item into a chest.
- Switch to your existing character.
- Take the item out of the chest, equip it and left click to spawn the Bunny.
