The Skull CTF

by Wokwi

A mind-bending hardware puzzle in three acts

View all updates Apr 02, 2021

Sleeps Most of the Day

by Uri Shaked

Ahoy Mateys!

So ya got yer Skull. Or, if you didn’t, then she ought to be paying you a visit real soon now. Either way, it’s time to forget about everything else. You have one goal now: get to the top. Nothing else matters.

What You Will Need

How to Get Help

Where to Brag

A Recap of the Rules

  1. No hardware modifications!
  2. Your solution should not rely on any kind of electrical connection to the skull.
  3. Your solution has to be reproducible, and you have to be able to explain how it works.

Send your solutions to uri+skull at wokwi dot com. You will be given a score in exchange.

About the Author

Uri Shaked


$3,298 raised

of $666 goal

495% Funded! Order Below

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

See Also

Subscribe to the Crowd Supply newsletter, highlighting the latest creators and projects: