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.

Thomas Rinsma, a security analyst and hobbyist tinkerer, recently figured out how to create a version of Tetris that runs inside a PDF file. According to a personal website post subsequently highlighted by BoingBoing on January 15th,

However, modern browsers can unlock more features for PDF documents, as proven by new ports of Tetris and DOOM. Thomas Rinsma, a security analysist and developer, published a working demonstration of the classic puzzle game Tetris running entirely in a PDF.