The Skull CTF

by Wokwi

A mind-bending hardware puzzle in three acts


  • Ouri L

    Givatayim, Israel

  • Nick F

    Campbell, CA

  • Conrad M

    Lacey, WA

  • Gerry B

    Baton Rouge, LA

  • Oliver P

    Portsmouth, United Kingdom of Great Britain and Northern Ireland

  • Pete H

    Berlin, Germany

  • Julian I

    Madison, WI

  • Drew S

    Rochester, NY

  • Jonathan T

    Vienna, VA

  • Michał D

    Lodz, Poland

  • David S

    North Las Vegas, NV

  • Or V

    Ramat Gan, Israel

  • Guy E

    Kfar Yehoshua, Israel

  • Ido B

    Ness Ziona, Israel

  • Yossi R

    Jerusalem, Israel

  • Allen L

    Stateline, NV

  • Jordi P

    San Francisco, CA

  • Aaron L

    Lincoln, NE

  • benjamin m

    efrat, Israel

  • Michael B

    Kefar Sava, Israel

  • Tobias F

    Zorneding, Germany

  • Michael M

    Glasgow, United Kingdom of Great Britain and Northern Ireland

  • Marc B

    Buffalo Grove, IL

  • Sebastian D

    Kaiserslautern, Germany

  • Eric V

    Philadelphia, PA

  • Michael A

    Baltimore, MD

  • Mehedi S

    San Jose, CA

  • Joel P

    Chicago, IL

  • Adam B

    Vallejo, CA

  • Austin P

    Clarinbridge, Ireland

  • Paul W

    San Diego, CA

  • Cody W

    San Diego, CA

  • Fredric C

    Hillsboro, OR

  • Tom J

    Aberdeen, United Kingdom of Great Britain and Northern Ireland

  • Matthew A


  • SK


  • Sean M

    Rainier, OR

  • Kalle L

    Turku, Finland

  • Alon R

    Tel Aviv, Israel

  • Michael S

    Herzelia, Israel

  • tuval b

    jerusalem, Israel

  • Erik L

    Vancouver, WA

  • Johnatha N

    Rishon LeZion, Israel

  • Jesse D

    New Haven, CT

  • Stephan L

    Uppsala, Sweden

  • michael p

    Hollywood, MD

  • Yaron B

    Ramat HaSharon, Israel

  • AJ

    London, United Kingdom of Great Britain and Northern Ireland

  • Dillon

    Pittsburgh, PA

  • Yoav W

    Petach Tikva, Israel

  • mountain view, CA

  • Marko R

    Windsor, Canada

  • Maria T

    Viseu, Portugal

  • Jay K

    Boulder, CO

  • Garret Kelly

$1,226 raised

of $666 goal

184% Funded!

Pledge Now


The Skull

A single The Skull CTF board (☠)


Two Skulls

A two-pack of The Skull CTF boards (☠☠)


Three Skulls

A three-pack of The Skull CTF boards (☠☠☠)


Pile o' Skulls - Classroom Pack

A ten-pack of The Skull CTF boards. (☠☠☠☠☠☠☠☠☠☠) Perfect for classrooms, workshops, conferences, and very nerdy Halloween parties.


Programmer & Header

Cheat! Or, better yet, design your own puzzles and load them into The Skull's brain using the included SparkFun PGM-09825 AVR Pocket Programmer. Also comes with a ribbon cable and the SMT header you'll need to use it. (Does not include the MiniUSB cable.) Some soldering skill required.


(Early Bird!) The Skull

A single The Skull CTF board (☠)



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

Uri Shaked

See Also

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