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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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Today's Challenge
minaminaominaminao
SITE/2
Web
Easy🌱
19 solves
Submissions (latest 3)
ctf-udon
ctf-udon

SOLVED!

Jun 14, 3:25 PM

kurgm

SOLVED!

Jun 14, 3:24 PM

edwowmath

SOLVED!

Jun 14, 3:23 PM

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🌱
1,885 solves
Upcoming challenges reveal the , , and in advance.
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Jun 2026

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Upcoming
Mon
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1
admin
Half-Year Recap
Misc
Welcome🌱
215 solves
2
minaminaominaminao
Cache Me If You Can
Web
Easy🌱
178 solves
3
minaminaominaminao
vm1
Misc
Medium
92 solves
4
pppp4649pppp4649
Small e
Crypto
Easy🌱
120 solves
5
minaminaominaminao
RPS GAME
Misc
Crypto
Medium
92 solves
6
nozokare
Flag for localhost
Web
Easy🌱
142 solves
7
tan90909090tan90909090
C++ flag checker
Rev
Hard
78 solves
8
shiragishiragi
Guess IP
Misc
Easy🌱
121 solves
9
nozokare
A Piece of DHKE
Crypto
Medium
77 solves
10
shiragishiragi
chmod-swapper
Misc
Medium
79 solves
11
tchentchen
Alpaca Certification
Web
Easy🌱
134 solves
12
rsk0315
Floating Equality
Misc
Medium
89 solves
13
pppp4649pppp4649
Elliptic Equation
Crypto
Hard
52 solves
14
tchentchen
CAuth
Web
Hard
58 solves
15
minaminaominaminao
SITE/2
Web
Easy🌱
19 solves
16
tan90909090tan90909090
Planned topicPNG
Misc
Medium
17
Coming soon
18
Coming soon
19
Coming soon
20
Coming soon
21
Planned topicHeap
Pwn
Hard
22
Coming soon
23
Coming soon
24
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25
Coming soon
26
Coming soon
28
Planned topicTBA
Pwn
Hard
29
Coming soon
30
Coming soon
1
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2
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3
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4
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5
Coming soon

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Writeups

tadanobutubutu

Writeup for CAuth

tadanobutubutu

ja
CAuth

39 minutes ago

tadanobutubutu

Writeup for Elliptic Equation

Writeup for Daily AlpacaHack 6/1-6/7

ja
Small e

+6

6 hours ago

nirvana

Writeup for Floating Equality

ja

2026/06/13 01:35

tadanobutubutu

Writeup for Floating Equality

nirvana

Writeup for Alpaca Certification

ja

2026/06/11 22:25

tadanobutubutu

Writeup for Alpaca Certification

nirvana

Writeup for chmod-swapper

ja

2026/06/11 01:15

Rows:

Integer Writer

Topic: Out-of-Bounds WriteReleased: Dec 5, 2025

357 solves
Pwn
Hard

by

mora

mora

USER

SOLVED AT

hori

9 hours ago

2026/06/08 10:01

2026/06/07 17:59

2026/06/02 13:55

2026/06/02 12:00

2026/06/02 03:05

2026/06/01 08:28

2026/05/26 13:36

2026/05/26 05:21

2026/05/25 08:32

2026/05/23 19:52

2026/05/19 06:55

2026/05/17 08:22

2026/05/16 00:30

2026/05/13 02:53

2026/05/06 08:06

2026/05/06 03:08

2026/05/06 02:36

2026/05/02 17:01

2026/05/02 05:45

2026/05/01 03:09

2026/04/30 04:12

2026/04/29 02:45

2026/04/24 06:44

2026/04/22 13:39

Rows:

descriptionsolveswriteupsupdates