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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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Today's Challenge
kanonkanon
honk the klaxon
Crypto
Medium
37 solves
Submissions (latest 3)
ahnmo
ahnmo

SOLVED!

Jun 24, 8:31 AM

nitcelcius

SOLVED!

Jun 24, 8:17 AM

kowerkoint

SOLVED!

Jun 24, 6:58 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🌱
1,909 solves
Upcoming challenges reveal the , , and in advance.
Prev

Jun 2026

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Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
admin
Half-Year Recap
Misc
Welcome🌱
237 solves
2
minaminaominaminao
Cache Me If You Can
Web
Easy🌱
199 solves
3
minaminaominaminao
vm1
Misc
Medium
95 solves
4
pppp4649pppp4649
Small e
Crypto
Easy🌱
134 solves
5
minaminaominaminao
RPS GAME
Misc
Crypto
Medium
96 solves
6
nozokare
Flag for localhost
Web
Easy🌱
156 solves
7
tan90909090tan90909090
C++ flag checker
Rev
Hard
84 solves
8
shiragishiragi
Guess IP
Misc
Easy🌱
140 solves
9
nozokare
A Piece of DHKE
Crypto
Medium
81 solves
10
shiragishiragi
chmod-swapper
Misc
Medium
84 solves
11
tchentchen
Alpaca Certification
Web
Easy🌱
155 solves
12
rsk0315
Floating Equality
Misc
Medium
89 solves
13
pppp4649pppp4649
Elliptic Equation
Crypto
Hard
59 solves
14
tchentchen
CAuth
Web
Hard
65 solves
15
minaminaominaminao
SITE/2
Web
Easy🌱
117 solves
16
tan90909090tan90909090
Xored PNG
Misc
Medium
84 solves
17
tchentchen
Looks like Alpacahack
Web
Medium
80 solves
18
shiragishiragi
Catrunner 2
Misc
Easy🌱
103 solves
19
minaminaominaminao
Flag Printer 20XX
Misc
Medium
61 solves
20
nozokare
xorshift521
Crypto
Hard
54 solves
21
k0080k0080
what-is-my-size
Pwn
Hard
63 solves
22
minaminaominaminao
✌️✌️✌️
Crypto
Easy🌱
84 solves
23
tchentchen
Secret Renderer
Web
Medium
69 solves
24
kanonkanon
honk the klaxon
Crypto
Medium
37 solves
25
colza
Planned topicArchive
Misc
Easy🌱
26
Coming soon
28
Planned topicTBA
Pwn
Hard
29
Coming soon
30
Coming soon
2
Planned topicMathematics
Crypto
Easy🌱
3
Coming soon
4
Coming soon
5
Coming soon

Want a harder challenge?

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Writeups

Daily AlpacaHackに挑戦するつくよみちゃん 06/23/Secret Renderer/tchen

tsukuyomi-chan

ja
Secret Renderer

16 hours ago

minaminao

Writeup for ✌️✌️✌️

author
ja

2026/06/22 17:14

Daily AlpacaHackに挑戦するつくよみちゃん 06/22/✌️✌️✌️/minaminao

tadanobutubutu

Writeup for ✌️✌️✌️

tadanobutubutu

Writeup for what-is-my-size

Daily AlpacaHackに挑戦するつくよみちゃん 06/20/xorshift521/nozokare

ja

2026/06/20 15:40

Rows:

power_obfus_royalty

Topic: [Mirror] TSG LIVE! CTFReleased: Dec 14, 2025

227 solves
Rev
Medium

by

iwashiira

iwashiira

USER

SOLVED AT

nuhe

2026/06/13 14:30

2026/06/06 16:36

2026/05/31 02:36

2026/05/27 05:22

2026/05/24 22:38

2026/05/09 03:25

2026/05/08 12:00

2026/05/08 02:17

2026/05/06 12:49

2026/05/04 14:39

2026/05/03 07:04

2026/04/29 07:27

2026/04/28 18:00

2026/04/24 10:12

2026/04/24 04:40

2026/04/22 15:08

2026/04/20 16:41

2026/04/15 16:45

2026/04/11 15:12

2026/04/10 09:03

2026/04/07 14:44

2026/04/01 12:15

2026/04/01 11:04

2026/03/30 16:54

2026/03/29 09:10

Rows:

descriptionsolveswriteups