827.

This game is a single 13 KiB file that runs on Windows, Linux and in the Browser.

iczelia.net/posts/snake-polyglot

A Windows PE header is followed by a shell script that extracts and decodes an ELF file, marking it executable and running it. The script then cleans up the temporary file. The extracted ELF file contains LZMA-packed x86_64 Linux code, which includes HTML content and a packed JavaScript game.