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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
21 solves
Submissions (latest 3)
tko919

SOLVED!

Jul 9, 3:59 AM

tadanobutubutu

SOLVED!

Jul 8, 9:49 PM

edwowmath

SOLVED!

Jul 8, 9:47 PM

Leaderboard
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tan90909090tan90909090
New Directory
Misc
Hard
24 solves
1-5
minaminaominaminao
missing ✌️
Crypto
Hard
27 solves
6-11
pppp4649pppp4649
Re:Small e
Crypto
Very Hard
21 solves
12-16
colza
Planned topicseccomp
Pwn
Hard
17-22
Planned topicNetwork
Misc
Very Hard
 
Planned topicNetwork
Misc
Very Hard
23
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Writeups

Writeup for missing ✌️

goroshirow

ja
missing ✌️

2026/07/07 15:19

tchen

Writeup for InstaTalk

author
en

2026/07/06 07:37

Rows:

Inu Profile

Topic: JavaScriptReleased: Feb 1, 2026

102 solves
Web
Very Hard5.5

by

st98

st98

I made a Web application that dogs can introduce themselves.

inu-profile.tar.gz

Please sign in to submit the flag.

descriptionsolveswriteups