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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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Discussion with friends or AI is welcome (account sharing is prohibited).

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Today's Challenge
pppp4649pppp4649
Σecret
Crypto
Easy🌱
24 solves
Submissions (latest 3)
curetwinkle
curetwinkle

SOLVED!

Oct 23, 9:55 AM

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🌱
24 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
Coming soon
1
Coming soon

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Writeups

Writeup for Mirage

haruhana

ja
Mirage

2026/10/22 02:56

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:

Xwitter

Topic: XSSReleased: Aug 24, 2026

48 solves
Web
Hard7.0

by

tchen

tchen

USER

SOLVED AT

ramveil

2026/10/09 07:51

2026/09/24 12:17

2026/09/20 15:35

2026/09/16 04:10

2026/09/09 08:46

2026/09/06 07:46

2026/09/05 08:01

2026/09/01 04:53

2026/08/30 06:33

2026/08/30 05:03

2026/08/30 01:04

2026/08/28 14:48

2026/08/28 07:12

2026/08/28 04:46

2026/08/27 10:59

2026/08/26 13:26

2026/08/26 13:11

2026/08/26 10:32

2026/08/26 04:22

2026/08/26 04:08

2026/08/25 16:04

2026/08/25 14:43

2026/08/25 12:36

2026/08/25 09:26

2026/08/25 09:15

Rows:

descriptionsolveswriteups