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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
kanonkanon
honk the klaxon
Crypto
Medium
28 solves
Submissions (latest 3)
itsuki-t

SOLVED!

Jun 24, 1:31 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🌱
1,908 solves
Upcoming challenges reveal the , , and in advance.
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Feb 2026

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26
keymoonkeymoon
git gc
Misc
Medium
166 solves
27
chocoruskchocorusk
ToyPQC
Crypto
Hard
114 solves
28
tchentchen
No JS
Web
Medium
149 solves
29
k0080k0080
shellcode-101
Pwn
Medium
153 solves
30
yu212yu212
Linear Coffee Generator
Crypto
Hard
120 solves
31
arkark
optimal-sort
Misc
Hard
107 solves
1
admin
Camelidae
Misc
Welcome🌱
428 solves
2
minaminaominaminao
Substance
Crypto
Easy🌱
259 solves
3
tan90909090tan90909090
read-a-binary
Rev
Easy🌱
254 solves
4
tchentchen
Magic Engine
Web
Easy🌱
301 solves
5
kanonkanon
RRe_Time_Limiter
Crypto
Medium
194 solves
6
minaminaominaminao
The World
Misc
Easy🌱
207 solves
7
tan90909090tan90909090
misdirection
Rev
Medium
176 solves
8
hiikunzhiikunz
Compressor
Misc
Hard
115 solves
9
tchentchen
Plz Login
Web
Medium
248 solves
10
k0080k0080
Alpaca-Llama Ranch
Pwn
Hard
138 solves
11
arkark
destructuring
Misc
Easy🌱
154 solves
12
hiikunzhiikunz
AAAAAAAAEEEEEEEESSSSSSSS
Crypto
Medium
132 solves
13
minaminaominaminao
nc magic
Misc
Medium
146 solves
14
hiikunzhiikunz
simple ROP
Pwn
Hard
129 solves
15
tchentchen
You are being redirected
Web
Medium
127 solves
16
kakur41kakur41
Alpaillier
Crypto
Medium
130 solves
17
rsk0315
wages of sin()
Rev
Misc
Hard
98 solves
18
k0080k0080
Disappeared
Pwn
Medium
127 solves
19
minaminaominaminao
Pickle Loader
Misc
Medium
123 solves
20
rsk0315
Dancing Cursor
Misc
Rev
Medium
114 solves
21
pppp4649pppp4649
CopperCopperCopper
Crypto
Hard
97 solves
22
k0080k0080
Noob programmer
Pwn
Hard
112 solves
23
kakur41kakur41
Alpaca Quest
Rev
Medium
125 solves
24
minaminaominaminao
hit-and-hit
Misc
Hard
89 solves
25
tchentchen
Alpaca Rangers
Web
Medium
168 solves
26
kurenaifkurenaif
27
tchentchen
28
minaminaominaminao
pyjs
Misc
Hard
87 solves
1
admin
Alpaca meets QR
Misc
Welcome🌱
351 solves

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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

10 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

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