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Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

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Solve each challenge within its time window to appear on the leaderboard.

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Today's Challenge
2501
Lean as a Service
Misc
Medium
19 solves
Submissions (latest 3)
roaris

SOLVED!

Oct 29, 1:02 PM

pppp4649

SOLVED!

Oct 29, 10:29 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🌱
2,321 solves
Upcoming challenges reveal the , , and in advance.
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Oct 2026

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k0080k0080
what is my pointer 2
Pwn
Hard
49 solves
1
admin
Baby Alpaca
Misc
Welcome🌱
170 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
84 solves
3-4
2501
Shared Prime
Crypto
Medium
90 solves
5-8
tan90909090tan90909090
fsbase modification
Pwn
Hard
62 solves
9-12
2501
Almost Shared Prime
Crypto
Hard
44 solves
 
2501
Almost Shared Prime
Crypto
Hard
44 solves
13-14
tan90909090tan90909090
cowsay jail
Misc
Medium
62 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
33 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
48 solves
25-28
k0080k0080
what is my pointer 4
Pwn
Hard
37 solves
 
k0080k0080
what is my pointer 4
Pwn
Hard
37 solves
29-31
2501
Lean as a Service
Misc
Medium
19 solves
1
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Writeups

Writeup for Alpaca Quest

haruhana

ja
Alpaca Quest

11 hours ago

tadanobutubutu

Writeup for Σecret

ja

2026/10/24 16:37

tadanobutubutu

Writeup for x32 ABI flag checker

Rows:

Día Nacional de la Alpaca

Topic: WelcomeReleased: Aug 1, 2026

271 solves
Misc
Welcome🌱1.5

by

admin

USER

SOLVED AT

nefer

2026/10/28 08:47

2026/10/26 08:41

2026/10/23 10:28

2026/10/21 08:48

2026/10/21 04:36

2026/10/20 07:29

2026/10/19 05:15

2026/10/13 09:03

2026/10/13 08:23

2026/10/09 02:16

2026/10/07 06:57

2026/10/06 08:54

2026/09/30 13:15

2026/09/30 04:10

2026/09/29 09:08

2026/09/29 08:46

2026/09/29 06:57

2026/09/28 14:34

2026/09/24 12:47

2026/09/23 16:27

2026/09/23 03:43

2026/09/21 20:43

2026/09/16 03:38

2026/09/15 13:41

2026/09/11 06:16

Rows:

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