Challenges

Category Web Pwn Reverse Crypto Forensics Misc OSINT Stego Blockchain Hardware Mobile

Difficulty Beginner Easy Medium Hard Insane

CTFtime weight

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Higher weight ≈ harder, more prestigious event.

Year

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CTF

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Must have Source / Docker Writeup

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Challenge	CTF	Weight	Category	Has
EASY_Cortex_Decay	BKCTF 2026	–	Crypto	files
Gotham_MicroSystems	BKCTF 2026	–	Crypto	files
Haystack	BKCTF 2026	–	Crypto	files
I_love_lean_2	BKCTF 2026	–	Crypto	files
The_Lost_Code	BKCTF 2026	–	Crypto	files
Y2K_But_Real	BKCTF 2026	–	Crypto	files
Y2K_Time_Capsule	BKCTF 2026	–	Crypto	files