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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!

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Solve within 24 hours of release to appear on the leaderboard.

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

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Sharing solutions is allowed only after 24 hours have passed since release.

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Today's Challenge

Half-Year Recap

Submissions (latest 3)

SOLVED!

May 31, 5:18 PM

SOLVED!

May 31, 5:08 PM

SOLVED!

May 31, 5:06 PM

Leaderboard

Period

Try the first challenge

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

AlpacaHack 2100

Upcoming challenges reveal the , , and in advance.

Jun 2026

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1

admin

Half-Year Recap

Misc

Welcome🌱

28 solves

2

Planned topicCache

Web

Easy🌱

3

Planned topicJail, JavaScript

Misc

Medium

4

Planned topicRSA

Crypto

Easy🌱

5

Planned topicRandom Number

Misc

Crypto

Medium

6

Planned topicImage Processing

Misc

Medium

7

Planned topicC++

Rev

Hard

8

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Want a harder challenge?

Writeups

Writeup for login-bonus-3

baumroll1234

ja

42 minutes ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/31/login-bonus-3/ptr-yudai

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1 hour ago

Writeup for login-bonus-3

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nitcelcius

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4 hours ago

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tsukuyomi-chan

ja

16 hours ago

Writeup for Slipboard

nirvana

ja

18 hours ago

Writeup for Slipboard

tadanobutubutu

ja

2026/05/30 16:23

Writeup for Slipboard

baumroll1234

ja

2026/05/30 15:42

Writeup for Decrypt Shop

kitatai

ja

2026/05/30 11:47

Daily AlpacaHackに挑戦するつくよみちゃん 05/29/Decrypt Shop/pppp4649

tsukuyomi-chan

ja

2026/05/30 06:59

Rows:

Half-Year Recap

Topic: WelcomeReleased: Jun 1, 2026

28 solves

Welcome🌱

by

admin

USER	SOLVED AT
mti	14 minutes ago
bsvac	25 minutes ago
baumroll1234	26 minutes ago
n0name	55 minutes ago
redpo	1 hour ago
tenagazaru	1 hour ago
kyokyokyo	1 hour ago
panya	1 hour ago
shiragi	1 hour ago
nomeaning	1 hour ago
nanashiku	2 hours ago
mak0tan	2 hours ago
hiikunz	2 hours ago
ntanaka	2 hours ago
itsuki-t	2 hours ago
itoshi	2 hours ago
quaran	2 hours ago
toomer	2 hours ago
nuhe	2 hours ago
edwowmath	2 hours ago
rsk0315	2 hours ago
pppp4649	2 hours ago
bhcnumas	2 hours ago
tadanobutubutu	2 hours ago
umineko	2 hours ago

Rows:

description solves