In the past, hackers have used this little-known Adobe feature to code simple games like Breakout and Tetris into PDF documents. But ading220 went further, recompiling a streamlined fork of Doom 's open source code using an old version of Emscripten that outputs optimized asm.js code.

You can play it on its official website which, of course, is just a PDF file that can be downloaded on your system

A developer has created a Doom port that can be played within a PDF file on a web browser. Aptly named "doom.pdf," the file allows you to boot up the original game and control the character using your keyboard,