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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
k0080k0080
what is my pointer 4
Pwn
Hard
8 solves
Submissions (latest 3)
mak0tan

SOLVED!

Oct 24, 6:15 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🌱
2,302 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🌱
155 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
77 solves
3-4
2501
Shared Prime
Crypto
Medium
87 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
60 solves
15-18
hiikunzhiikunz
decreasing
Misc
Hard
34 solves
19-22
tan90909090tan90909090
x32 ABI flag checker
Rev
Hard
31 solves
23-24
pppp4649pppp4649
Σecret
Crypto
Easy🌱
40 solves
25-28
k0080k0080
what is my pointer 4
Pwn
Hard
8 solves
 
k0080k0080
what is my pointer 4
Pwn
Hard
8 solves
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

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Writeups

tadanobutubutu

Writeup for Σecret

tadanobutubutu

ja
Σecret

2 hours ago

tadanobutubutu

Writeup for x32 ABI flag checker

ojun

Writeup for fsbase modification

ja

2026/10/15 13:59

Rows:

fsbase modification

Topic: x86Released: Oct 5, 2026

59 solves
Pwn
Hard7.5

by

tan90909090

tan90909090

USER

SOLVED AT

0daydeactive

2026/10/19 18:44

2026/10/14 12:54

2026/10/14 11:56

2026/10/12 08:32

2026/10/12 07:52

2026/10/12 02:50

2026/10/11 14:47

2026/10/11 12:11

2026/10/10 11:38

2026/10/10 05:05

2026/10/10 01:29

2026/10/08 14:06

2026/10/08 13:04

2026/10/08 11:21

2026/10/08 10:14

2026/10/08 09:51

2026/10/08 02:54

2026/10/08 00:40

2026/10/07 21:52

2026/10/07 19:19

2026/10/07 17:35

2026/10/07 08:18

2026/10/07 04:39

2026/10/07 04:17

2026/10/06 20:54

Rows:

descriptionsolveswriteups