The only way to switch an existing world to Hardcore mode is to use a third-party app to edit the game's files. How to change game modes in 'Minecraft: Java Edition' 1. Launch "Minecraft," and select ...

Go to File, click Save, and name it Dark Mode, or another appropriate title. Creating the Keyboard Shortcut Open System Preferences, click on Keyboards, then go to the Shortcuts tab.

While Survival mode is fun, Minecraft has much more to offer. Here's how to change game modes on Minecraft at any time.

The only way to switch an existing world to Hardcore mode is to use a third-party app to edit the game's files. How to change game modes in 'Minecraft: Java Edition' 1.