Matthew Gatland


June 25, 2017

The twenty-first game from my one-game-a-day project.

Play Playfair or scroll down to learn more.

Playfair screenshot

When I was in high school a friend gave me a letter with an encrypted message. I tried to decode it using frequency analysis (using a Microsoft Excel spreadsheet to do the math). It would have worked if it was a simple substitituion cypher, but it was not. It was a Playfair cypher!

If you ever recieve one of these, this game – more of an interactive tutorial – will teach you how to decode it properly.

Development time: 2 hours, 11 minutes.

My tweet from the release:

This one isn’t quite a game but it is educational! #onegameaday

See the full twitter thread.