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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
The 3rd
Crypto
Hard
13 solves
Submissions (latest 3)
a01sa01to
a01sa01to

SOLVED!

Sep 22, 2:11 AM

edwowmath

SOLVED!

Sep 21, 10:27 PM

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🌱
2,213 solves
Upcoming challenges reveal the , , and in advance.
Prev

Sep 2026

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tchentchen
Springing
Web
Medium
74 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
125 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
101 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
63 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
 
minaminaominaminao
Bitflip RSA
Crypto
Hard
56 solves
9-11
minaminaominaminao
\^o^/
Misc
Hard
43 solves
12-13
tan90909090tan90909090
sin function vs. fsin instruction
Rev
Misc
Medium
55 solves
14-15
tan90909090tan90909090
integer division
Misc
Medium
69 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
41 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
39 solves
22-24
2501
The 3rd
Crypto
Hard
13 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
Coming soon
2
Coming soon
3
Coming soon
4
Coming soon

Want a harder challenge?

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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2 hours ago

Rows:

Beat the Alpaca Lord

Topic: JSONReleased: Jul 16, 2026

104 solves
Web
Medium5.0

by

tchen

tchen

USER

SOLVED AT

giumox

2026/09/10 16:06

2026/09/06 10:40

2026/09/05 05:05

2026/09/01 15:22

2026/08/29 12:02

2026/08/26 08:38

2026/08/15 15:31

2026/08/12 15:47

2026/08/12 15:08

2026/08/12 05:28

2026/08/11 15:30

2026/08/09 03:58

2026/08/03 14:09

2026/07/26 13:55

2026/07/23 22:25

2026/07/22 12:36

2026/07/20 12:39

2026/07/19 04:59

2026/07/18 08:56

2026/07/18 00:42

2026/07/17 17:53

2026/07/17 13:19

2026/07/17 11:08

2026/07/17 10:00

2026/07/17 09:09

Rows:

descriptionsolveswriteups