wtf is classic-0.24_03?

This project takes an old version of Minecraft Classic, version 0.24_03, and makes it playable directly in a web browser. It does this using a tool called TeaVM, which converts Java code into JavaScript or WebAssembly so it can run without needing Java installed on the visitor's machine. The README is mostly a set of build instructions rather than a description of gameplay features, so what follows reflects that focus. The project offers two ways to build a browser-ready version. One path compiles a plain JavaScript client, producing files that include the game's code and its assets, along with an offline downloadable version. The other path compiles a WebAssembly version using a custom fork of TeaVM built specifically for this kind of project, again producing a bundled file with code and assets plus an offline download option. There is also a desktop runtime you can build and run using Java directly, powered by a graphics library called LWJGL3. The author is clear that this desktop version exists only for debugging and testing purposes such as chasing down crashes more quickly, and warns against distributing it to end users, since testing only on the desktop version tends to hide bugs that only show up in an actual browser. Building any of these versions requires exactly Java 17. Older or newer Java versions are explicitly stated not to work. The README also includes some technical guidance for developers who want to debug the desktop runtime from their own development environment, including specific JVM startup arguments and a note about an Nvidia driver setting on Linux that may need to be disabled to avoid problems. Overall, this is a build and porting project rather than a game with new features of its own. It exists to let people experience a specific classic version of Minecraft inside a browser tab, using modern web technology to avoid requiring a Java installation.