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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
10 solves
Submissions (latest 3)
blackade

SOLVED!

Oct 25, 12:30 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🌱
2,302 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🌱
156 solves
2
tan90909090tan90909090
C# File-based app
Rev
Easy🌱
78 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
10 solves
 
k0080k0080
what is my pointer 4
Pwn
Hard
10 solves
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

Want a harder challenge?

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Writeups

tadanobutubutu

Writeup for Σecret

tadanobutubutu

ja
Σecret

8 hours ago

tadanobutubutu

Writeup for x32 ABI flag checker

ojun

Writeup for fsbase modification

ja

2026/10/15 13:59

Rows:

Baby Alpaca

Topic: WelcomeReleased: Oct 1, 2026

156 solves
Misc
Welcome🌱1.5

by

admin

USER

SOLVED AT

shohei

38 minutes ago

12 hours ago

2026/10/22 06:32

2026/10/22 01:53

2026/10/21 23:37

2026/10/21 13:12

2026/10/21 09:40

2026/10/21 08:42

2026/10/21 08:31

2026/10/20 02:59

2026/10/19 19:57

2026/10/19 14:03

2026/10/19 07:31

2026/10/19 06:12

2026/10/19 04:45

2026/10/17 14:04

2026/10/16 10:51

2026/10/16 07:24

2026/10/16 01:26

2026/10/14 15:14

2026/10/13 23:33

2026/10/13 21:08

2026/10/13 15:46

2026/10/13 14:33

2026/10/13 08:17

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descriptionsolveswriteups