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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
31 solves
Submissions (latest 3)
yahari

SOLVED!

Sep 23, 1:09 PM

sp1n0z4

SOLVED!

Sep 23, 12:34 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🌱
2,217 solves
Upcoming challenges reveal the , , and in advance.
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Sep 2026

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tchentchen
Springing
Web
Medium
74 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
127 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
103 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
70 solves
16-18
edwowmathedwowmath
neighboRhood_diStAnce
Crypto
Hard
42 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
45 solves
22-24
2501
The 3rd
Crypto
Hard
31 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
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2
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3
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2026/09/21 23:48

Rows:

Rock Paper Scissors Lizard Spock

Topic: GeneralReleased: Feb 27, 2026

112 solves
Web
Hard5.0

by

tchen

tchen

USER

SOLVED AT

giumox

2026/09/07 10:55

2026/08/26 03:26

2026/08/16 10:35

2026/08/01 13:02

2026/07/13 09:27

2026/07/12 06:04

2026/07/03 01:55

2026/05/16 04:04

2026/05/13 01:31

2026/05/06 11:55

2026/05/05 05:24

2026/05/03 02:32

2026/04/29 15:10

2026/04/25 07:22

2026/04/16 12:29

2026/04/14 15:07

2026/04/10 14:51

2026/04/02 08:43

2026/03/31 07:32

2026/03/31 05:52

2026/03/28 15:59

2026/03/27 11:08

2026/03/21 13:57

2026/03/20 11:45

2026/03/16 10:22

Rows:

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