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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
pppp4649pppp4649
Σecret
Crypto
Easy🌱
11 solves
Submissions (latest 3)
mak0tan

SOLVED!

Oct 22, 7:35 PM

kurgm

SOLVED!

Oct 22, 7:10 PM

Leaderboard

Try the first challenge

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

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,300 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
47 solves
1
admin
Baby Alpaca
Misc
Welcome🌱
154 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
76 solves
3-4
2501
Shared Prime
Crypto
Medium
86 solves
5-8
tan90909090tan90909090
fsbase modification
Pwn
Hard
59 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
59 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
29 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
11 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
1
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Writeups

Writeup for Mirage

haruhana

ja
Mirage

18 hours ago

ojun

Writeup for fsbase modification

ja

2026/10/15 13:59

tadanobutubutu

Writeup for cowsay jail

ja

2026/10/15 08:42

tadanobutubutu

Writeup for Almost Shared Prime

nirvana

Writeup for cowsay jail

ja

2026/10/14 21:19

Rows:

Vending Machine: Revised Version

Topic: PythonReleased: Sep 5, 2026

101 solves
Misc
Easy🌱2.0

by

baumroll1234

USER

SOLVED AT

tikisan0531

14 hours ago

14 hours ago

2026/10/20 14:04

2026/10/20 03:30

2026/10/13 08:25

2026/10/13 06:04

2026/10/08 17:33

2026/10/08 07:24

2026/10/06 10:15

2026/09/28 15:22

2026/09/28 01:26

2026/09/25 11:02

2026/09/25 07:22

2026/09/22 12:15

2026/09/20 06:14

2026/09/18 03:50

2026/09/18 01:09

2026/09/17 19:26

2026/09/17 13:01

2026/09/17 04:48

2026/09/16 10:27

2026/09/15 12:06

2026/09/15 11:51

2026/09/15 09:17

2026/09/15 06:37

Rows:

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