A Multipart Series about Number Spies; a voice-first game for Amazon Alexa

Image for post
Image for post
Number Spies promotional ad for social media


In the Fall of 2019, I officially started the journey of creating Number Spies for Amazon Alexa. The idea for the game started at least a year earlier, but I finally had the skills needed for the core functionality. I spent hundreds of hours over many months writing code and expanding on the game idea.

It was a one-person operation that was at times both exhilarating and exhausting.

In the Spring of 2020, I released Number Spies. …

A Headless CMS for you Game Content


The best way to modify your game content is to put it into a Content Management System (CMS). That way changes to the content can happen without the need to recompile the content in code. You could put the content into a database or someplace else, but a CMS is special-built for this purpose.

There are a number of CMS solutions available. One category is called a “headless” CMS to make it clear that the content is not tied to a specific output such as a website. …

Architecture and Services to Support the Game

Image for post
Image for post


In the previous article, we talked about how Number Spies started with making an Alexa Flash Briefing to duplicate the behavior of a numbers station. That idea grew into a voice game in the form of an Alexa Skill.

In order to create the encoded messages, I knew there needed to be an audio processing backend. This was the part that delayed the project for many months as I didn’t know how to do the audio processing.

Along the way, more components were added to the system until it became the system shown in the diagram. …

A game about spies, coded messages, and numbers stations.

Image for post
Image for post
Encoding and decoding a message with a One-time Pad


When creating a game, there are many things to consider. How many players? Is the game genre adventure, RPG, puzzle game, or one of many other choices? What is the theme? Those are just some of the important questions that need to get answered, but for Number Spies it all started with the idea of re-creating the experience of a numbers station on a smart speaker.

Numbers Station

A numbers station is a radio station that broadcasts on shortwave radio frequencies and is used by intelligence officers to transmit encoded messages. Numbers stations have been used since World War I and throughout the Cold War and still exist today. Anyone with a shortwave radio can tune in to the proper frequency and hear the list of numbers that are being spoken, but only those with the proper tools can decode the message. One of the first transmissions that I heard was from the station called The Lincolnshire Poacher. …


Mark Tucker

Alexa Champion 🏆, Bixby Premier Developer, Software Architect, Speaker 🎙️, Author

Get the Medium app

A button that says 'Download on the App Store', and if clicked it will lead you to the iOS App store
A button that says 'Get it on, Google Play', and if clicked it will lead you to the Google Play store