B-SIDE

A daily CTF challenge with a fun new puzzle every day

What is B-SIDE?

This side program features challenges with a different flavor from Daily AlpacaHack. We publish one harder or more unconventional challenge every few days.

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Solve each challenge within its time window to appear on the leaderboard.

Not a Competition

Discussion with friends or AI is welcome (account sharing is prohibited).

Solution Sharing Rules

Sharing solutions is allowed only after the challenge period has ended.

New to CTFs?

This program features higher difficulty and unconventional challenges. Try the beginner-friendly Daily AlpacaHack first to warm up.

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Today's Challenge

Submissions (latest 3)

kurgm

SOLVED!

May 9, 5:18 PM

rsk0315

SOLVED!

May 9, 9:32 AM

n0v4

SOLVED!

May 9, 12:58 AM

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Aug 2055

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Writeups

Writeup for The Sandbox nozokare ja The Sandbox 10 hours ago
Writeup for The Sandbox bsvac en The Sandbox 14 hours ago
Writeup for useful-gadget nozokare ja useful-gadget 4 days ago
Writeup for simple ROP? nozokare ja simple ROP? 5 days ago
Writeup for Blind Sort rsk0315 ja Blind Sort last week
Writeup for Bulk Note tadanobutubutu ja Bulk Note last week
Writeup for Is this Twisted? tadanobutubutu ja Is this Twisted? last week
Writeup for Bulk Note nozokare ja Bulk Note 2 weeks ago
Writeup for Is this Twisted? nozokare ja Is this Twisted? 2 weeks ago
Writeup for one_gadget nozokare ja one_gadget 2 weeks ago

Rows:

Stealerusk

Topic: WindowsReleased: Feb 21, 2026

47 solves

Rev

Very Hard

chocorusk