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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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Today's Challenge
minaminaominaminao
Git Note
Misc
Hard
12 solves
Submissions (latest 3)
toomer

SOLVED!

May 24, 3:05 PM

Leaderboard
Upcoming challenges reveal the , , and in advance.
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May 2026

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iwancofiwancof
Blind Sort
Pwn
Very Very Hard
14 solves
1-3
kakur41kakur41
simple ROP?
Pwn
Hard
35 solves
4-7
minaminaominaminao
The Sandbox
Misc
Web
Very Hard
26 solves
8-11
k0080k0080
swap-system
Pwn
Very Hard
24 solves
 
k0080k0080
swap-system
Pwn
Very Hard
24 solves
12-15
tchentchen
Iframe Sandbox
Web
Very Hard
28 solves
16-19
minaminaominaminao
Secret Fail
Misc
Very Hard
20 solves
 
minaminaominaminao
Secret Fail
Misc
Very Hard
20 solves
20-23
kanonkanon
Hennessy
Crypto
Very Hard
21 solves
24-26
minaminaominaminao
Git Note
Misc
Hard
12 solves
 
minaminaominaminao
Git Note
Misc
Hard
12 solves
27-29
tchentchen
Planned topicXSS
Web
Hard
30
Coming soon
31
Coming soon

Writeups

hxuu

Writeup for Resume Maker

hxuu

en
Resume Maker

2026/05/23 15:58

hxuu

Writeup for Bulk Note

en

2026/05/22 23:25

hxuu

Writeup for Iframe Sandbox

en

2026/05/21 20:28

kurgm

Writeup for The Sandbox

ja

2026/05/17 06:30

pppp4649

Writeup for Life is probably full of bugs

author
ja

2026/05/10 01:27

Rows:

Bulk Note

Topic: YAMLReleased: Apr 22, 2026

28 solves
WebMisc
Hard

by

tchen

tchen

I made a note app than can create multiple notes! Can you read the hidden note?

bulk-note.tar.gz

Please sign in to submit the flag.

descriptionsolveswriteups