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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

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

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

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Today's Challenge
minaminaominaminao
\^o^/
Misc
Hard
20 solves
Submissions (latest 3)
reid

SOLVED!

Sep 9, 12:06 PM

kakur41

SOLVED!

Sep 9, 11:56 AM

hiikunz

SOLVED!

Sep 9, 9:53 AM

Leaderboard

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
2,192 solves
Upcoming challenges reveal the , , and in advance.
Prev

Sep 2026

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Upcoming
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tchentchen
Springing
Web
Medium
67 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
103 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
83 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
54 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
42 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
42 solves
9-11
minaminaominaminao
\^o^/
Misc
Hard
20 solves
12
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Want a harder challenge?

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Writeups

gattoartz

Writeup for Leaked Flag Checker

gattoartz

ja
Leaked Flag Checker

2026/09/07 13:39

gattoartz

Writeup for a fact of CTF

ja

2026/09/07 13:08

gattoartz

Writeup for AlpacaHack 2100

ja

2026/09/07 13:07

Writeup for Vending Machine: Revised Version

author
ja

2026/09/06 15:02

nitcelcius

Writeup for Vending Machine: Revised Version (warn: some code reading ahead)

nitcelcius

Writeup for Let's Shut Down Linux (with reading)

curetwinkle

Writeup for Springing

ja

2026/09/05 05:10

Rows:

Twilight

Topic: FunctionReleased: Dec 18, 2025

266 solves
Rev
Medium4.5

by

kanon

kanon

Writeups

kanon

daily-alpacahack-twilight | kanon the blog

kanon

author
ja

2025/12/20 00:57


mimumi

Writeup for Twilight (old ver; ~0:13)

ja

2025/12/18 15:01


kakur41

Writeup for Twilight

ja

2025/12/18 15:09


mgcup

Writeup for Twilight

ja

2025/12/18 17:19


chjwoo

Writeup for Twilight

en

2025/12/20 00:40



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