Download Jonia

Launcher 2.0. One download gets the launcher; it fetches the games and keeps them current. Java is included: download, unzip, double-click, pick a game.

Windows Jonia-windows.zip, 33MB. Open Jonia.bat macOS Jonia-mac.zip, 65MB. Intel and Apple Silicon, open Jonia.app Linux Jonia-linux.tar.gz, 36MB. Run ./jonia

The first time you open it

macOS says it can't check Jonia for malicious software (it isn't from a paid Apple developer). Click Done, open System Settings > Privacy & Security, scroll down and click Open Anyway. Only once.

Windows may say "Windows protected your PC": click More info, then Run anyway.

The launcher then downloads the games (about 97MB) and keeps them up to date by itself.

Already have Java 21? jonia-launcher.jar is the launcher on its own.