Show HN: A playable game of Tetris inside a PDF

I realized that the PDF engines of modern desktop browsers (PDFium and PDF.js) support JavaScript with enough I/O primitives to make a basic game like Tetris.

It was a bit tricky to find a union of features that work in both engines, but in the end it turns out that showing/hiding annotation "fields" works well to make monochrome pixels, and keyboard input can be achieved by typing in a text input box.

All in all it's quite janky but a nice reminder of how general purpose PDF scripting c

6mo | Hacker news

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