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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.

Join Anytime

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.

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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
pppp4649pppp4649
Re:Small e
Crypto
Very Hard
4 solves
Submissions (latest 3)
kurgm
kurgm

SOLVED!

Jul 5, 6:18 PM

Leaderboard
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Jul 2026

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tan90909090tan90909090
New Directory
Misc
Hard
24 solves
1-5
minaminaominaminao
missing ✌️
Crypto
Hard
24 solves
6-11
pppp4649pppp4649
Re:Small e
Crypto
Very Hard
4 solves
12
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Writeups

Writeup for Resume Maker

00xcanelo

ar
Resume Maker

2026/07/02 18:37

tchen

Writeup for YAuth

author
en

2026/06/20 16:06

tchen

Writeup for Iframe Sandbox

author
en

2026/06/20 16:05

tchen

Writeup for Bulk Note

author
en

2026/06/20 16:05

Rows:

InstaTalk

Topic: XSSReleased: Jun 16, 2026

21 solves
Web
Very Hard8.0

by

tchen

tchen

USER

SOLVED AT

icesfont

2026/06/23 18:37

2026/06/20 12:00

2026/06/20 11:43

2026/06/20 11:25

2026/06/20 04:07

2026/06/19 21:33

2026/06/18 13:32

2026/06/18 12:29

2026/06/18 12:16

2026/06/17 14:31

2026/06/17 01:11

2026/06/16 17:21

2026/06/16 07:28

2026/06/16 03:20

2026/06/16 01:18

2026/06/15 23:45

2026/06/15 22:35

2026/06/15 20:17

2026/06/15 17:25

2026/06/15 16:16

2026/06/15 15:30

Rows:

descriptionsolveswriteups