Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

Join Anytime

Solve within 24 hours of release 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 24 hours have passed since release.

Solve stats

No solved challenges yet.

Today's Challenge

Submissions (latest 3)

bhcnumas

SOLVED!

Jul 3, 9:00 PM

baumroll1234

SOLVED!

Jul 3, 8:54 PM

n0name

SOLVED!

Jul 3, 7:41 PM

Leaderboard

Period

Try the first challenge

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

Upcoming challenges reveal the , , and in advance.

Jul 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Nano Services

Web

Medium

66 solves

minaminao

Super Short System Exit

Misc

Medium

76 solves

admin

Alpaca Nation

Misc

Welcome🌱

138 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

95 solves

tchen

Lucky Redirect

Web

Easy🌱

83 solves

hiikunz

Renda

Rev

Medium

30 solves

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Lucky Redirect

baumroll1234

Lucky Redirect

1 hour ago

Writeup for Alpaca Quest

tadanobutubutu

Alpaca Quest

1 hour ago

Writeup for Flag is A+B

nirvana

Flag is A+B

9 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん07/02/Flag is A+B/hiikunz

tsukuyomi-chan

Flag is A+B

2026/07/02 16:20

Writeup for Flag is A+B

baumroll1234

Flag is A+B

2026/07/02 15:21

Writeup for glibc's secret function

haruhana

glibc's secret function

2026/07/02 02:32

Writeup for 108

haruhana

108

2026/07/01 03:07

Daily AlpacaHackに挑戦するつくよみちゃん06/30/Super Short System Exit/minaminao

tsukuyomi-chan

Super Short System Exit

2026/06/30 17:52

Writeup for Super Short System Exit

nitcelcius

Super Short System Exit

2026/06/30 15:38

Writeup for Nano Services

aiueo6614

Nano Services

2026/06/30 10:10

Rows:

Lucky Redirect

Topic: GeneralReleased: Jul 3, 2026

83 solves

Web

Easy🌱3.0

tchen

USER	SOLVED AT
nakamulab	5 hours ago
onotch	6 hours ago
nirvana	6 hours ago
labpump	6 hours ago
kitatai	6 hours ago
jjj-miso	6 hours ago
shinyaaaaa	6 hours ago
shibe-hasu	7 hours ago
cocoa	7 hours ago
reid	7 hours ago
ss8888888	8 hours ago
kurokane-isumi	8 hours ago
serioton	8 hours ago
nomeaning	9 hours ago
hitto	9 hours ago
nitcelcius	9 hours ago
unity	9 hours ago
cfba82eb	9 hours ago
tadanobutubutu	10 hours ago
hanadidez0u	10 hours ago
roaris	10 hours ago
hulgas	12 hours ago
kame	12 hours ago
dankiti	14 hours ago
shiragi	14 hours ago