Plays inside your own copy of Minecraft: Java Edition, on your device, not in a browser tab. Opens curseforge.com in a new tab.
How to play
Have your own copy of Minecraft: Java Edition installed: the mashup plays inside it.
Download it from its release page on CurseForge (it runs on Windows, macOS and Linux).
Install it as its page says. What it asks for is just below, in the list's words.
Start the game the way its page says: some mashups come with a launcher of their own.
What it asks for
A supported Minecraft Java version and loader. On first in-game launch the client asks before downloading the Chromium runtime; Windows on ARM falls back to opening games in the system browser.