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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
25 solves
Submissions (latest 3)
prof

SOLVED!

Sep 22, 3:03 PM

Leaderboard

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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🌱
2,214 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🌱
126 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
102 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
41 solves
19-21
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
 
hiikunzhiikunz
nested eval
Misc
Hard
43 solves
22-24
2501
The 3rd
Crypto
Hard
25 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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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

18 hours ago

Rows:

Flags for the FLAG

Topic: UnicodeReleased: Mar 19, 2026

184 solves
Misc
Easy🌱2.0

by

rsk0315

USER

SOLVED AT

kazuki-hosoe

2026/09/01 14:15

2026/08/31 01:27

2026/08/30 15:22

2026/08/25 11:30

2026/08/24 14:45

2026/08/22 16:03

2026/08/21 01:24

2026/08/15 13:35

2026/08/14 03:25

2026/08/11 02:44

2026/08/09 09:13

2026/08/08 13:18

2026/08/08 01:55

2026/08/04 05:31

2026/07/30 08:15

2026/07/30 05:24

2026/07/26 08:55

2026/07/25 14:26

2026/07/25 09:47

2026/07/17 01:51

2026/07/14 02:21

2026/07/06 03:05

2026/07/06 02:29

2026/06/19 21:37

2026/06/04 21:49

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