CTFs

Hex-Rays's CTFs

• Free Madame De Maintenon
• Madame De Maintenon’s Cryptographic Pursuit – Unmasking the Traitors
• Madame de Maintenon's Enigmatic Bouillotte Game

Google / Mandiant

• Y0da challenge - Mandiant's FlareOn10 CTF
• Catbert challenge - Mandiant's FlareOn11 CTF

Blizzard Entertainment

• Blizzard 2017 CTF