PONGS
The same game, made five times, in five languages.
You against the computer. First to 7 wins.
JavaScript
The original. The browser's own language, so nothing extra to load.
Rust
With macroquad. Small and fast.
C
With raylib, compiled by Emscripten. The smallest of the lot.
Go
With Ebitengine. The biggest download, so give it a moment.
Python
With MicroPython, a small Python compiled to WebAssembly. Even the drawing is Python.