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!

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

tan90909090

Let's Shut Down Linux

Misc

Medium

14 solves

Submissions (latest 3)

zexco

SOLVED!

Sep 2, 9:51 PM

toomer

SOLVED!

Sep 2, 7:43 PM

bhcnumas

SOLVED!

Sep 2, 6:15 PM

Leaderboard

Period

Try the first challenge

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

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Sep 2026

Solved

Unsolved

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Mon

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Fri

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Sun

tchen

Springing

Web

Medium

62 solves

admin

QUIZ ALPACASHOCK

Misc

Welcome🌱

79 solves

hiikunz

base 16-32-64

Misc

Easy🌱

52 solves

3-4

tan90909090

Let's Shut Down Linux

Misc

Medium

14 solves

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for base 16-32-64

baumroll1234

base 16-32-64

48 minutes ago

Writeup for Flag is A+B

haruhana

Flag is A+B

19 hours ago

Writeup for Springing

f1023n

Springing

2026/09/01 09:05

Writeup for Xwitter

tchen

author

Xwitter

2026/08/29 05:39

Writeup for Let's analyze system calls

baumroll1234

Let's analyze system calls

2026/08/29 04:42

Writeup for Flag is A+B

alpha0314sub

Flag is A+B

2026/08/29 01:57

Writeup for Let's analyze system calls

mizore-fuyu

Let's analyze system calls

2026/08/28 23:24

Writeup for Encoding Basics

power

Encoding Basics

2026/08/26 12:20

Writeup for Bars

power

Bars

2026/08/26 08:34

Writeup for Vending Machine

haruhana

Vending Machine

2026/08/26 01:41

Rows:

base 16-32-64

Topic: EncodingReleased: Sep 2, 2026

52 solves

Misc

Easy🌱1.5

hiikunz

Tags

USER	SOLVED AT
cqbtq	4 hours ago
nanashiku	6 hours ago
chara0x	6 hours ago
nemukemo	7 hours ago
foobarfoo	8 hours ago
kurokane-isumi	8 hours ago
sniperthrilla	8 hours ago
nitcelcius	8 hours ago
kapumoka	8 hours ago
guren	8 hours ago
kakur41	10 hours ago
mkmk	10 hours ago
pppp4649	10 hours ago
labpump	10 hours ago
lumma	11 hours ago
wanui	11 hours ago
hori	12 hours ago
gin	12 hours ago
xnmhuveb	12 hours ago
nomeaning	13 hours ago
blackade	15 hours ago
shiragi	15 hours ago
kojikazu2005	16 hours ago
s-aoki	17 hours ago
ctf-udon	18 hours ago

Rows:

description solves writeups