The Skull CTF

by Wokwi

A mind-bending hardware puzzle in three acts

View all updates Dec 23, 2020

Scary Christmas!

by Uri Shaked

Ahoy Mateys!

[זנב תולע]%

With Christmas just around the corner, we decided to take advantage of The Skull’s expansion pins to bring you a best-in-class Yuletide experience by plugging in a rare-earth magnet speaker and creating a special, open-source, hand-written firmware for the occasion. We are proud to present the results!

While planning the video above, we had a lively discussion on our Diꜱcord channel, where some brave soul suggested that we plug an AM antenna into The Skull and turn her into a pirate radio station. That definitely sounds like our kind of project, and we might very well give it a try!

Meanwhile, we’ve started getting quotes from contract manufacturers who want to build your Skull. As anticipated, setting up a geothermal steam-soldering process is no mean feat, but it pales in comparison to the trials one must endure when preparing to ship CR2032 batteries internationally. We’ve been turned down by several CMs, and are still trying to figure out the secret sauce that will allow us to ship with "batteries included." Wish us luck.

Scary Christmas, everyone!

About the Author

Uri Shaked


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Product Choices


The Skull

A single The Skull CTF board (☠)


SparkFun Programmer

From the Crowd Supply Basics project.

Design your own puzzles and load them into The Skull's brain using this programmer! Mini USB cable not included.

AVR Pocket Programmer by SparkFun


EconoStik Header: DR VT SMT 2x3

From the Crowd Supply Basics project.

Use with the SparkFun Programmer.

One Amphenol FCI EconoStik™ 2.54mm Header. SMD/SMT Mounting style, Straight angled male pins, gold-plating. Voltage rating: 110 V



Wokwi creates tools for the Arduino and maker community, such as AVR8js, the Open source Arduino Simulator, and GoodArduinoCode.

Uri Shaked

JA Electronics


PCB Fabrication & PCB Assembly

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