Suppose you’ve spent dozens of hours investing time, construction, and adventuring into a Hardcore mode world in Minecraft, only to have it all snatched away when you take an unexpected long fall or get killed by a boss monster. In that case, you know how frustrating it can be to lose everything instantly. The Hardcore Map Reset mod kind of defeats the purpose of playing Hardcore mode on vanilla maps because the point is that you lose everything when you die – it adds a lot of excitement and tension to a game that is usually laid back and pretty boring.
However, if you’re a mod developer with a great map you want to share with other people, and you’ve set it to Hardcore, Hardcore Map Reset can save your end users a lot of time and frustration by resetting maps to their original starting positions, rather than forcing players to uninstall and reinstall them when they die. They will technically still lose everything on death, but the world will start over fresh and ready for them to try and beat it again. You can also save different instances of the same map and reset to different ones, but this defeats the purpose of playing Hardcore mode.
As a mod pack dev:
You will want to copy the template maps into the maps folder as a mod pack dev. Then in that maps folder, create an info.json file. This should look like this:
The thumbnail tag should point to a square logo/screenshot of your map so the user can easily see what the map is like. In testing, this was a 128×128 size image. As long as it is a square image, you should be good.
How to Use
Copy all of the maps that you want into the maps folder.
When you are ready to reset your world click the reset world button.