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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
29 solves
Submissions (latest 3)
kuroiko

SOLVED!

Sep 23, 7:33 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🌱
2,215 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🌱
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
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
29 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
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2026/09/21 23:48

Rows:

wrong instruction

Topic: ObfuscationReleased: Aug 18, 2026

61 solves
Rev
Hard4.0

by

tan90909090

tan90909090

USER

SOLVED AT

serioton

serioton

2026/09/12 20:38

2026/09/08 15:06

2026/08/27 14:36

2026/08/25 21:03

2026/08/23 19:47

2026/08/23 12:07

2026/08/23 09:16

2026/08/22 14:39

2026/08/21 07:20

2026/08/21 01:48

2026/08/21 01:00

2026/08/20 22:41

2026/08/20 13:46

2026/08/20 13:28

2026/08/20 10:14

2026/08/20 09:28

2026/08/20 00:16

2026/08/19 19:01

2026/08/19 14:29

2026/08/19 13:43

2026/08/19 13:18

2026/08/19 08:23

2026/08/19 05:28

2026/08/19 02:00

2026/08/19 00:51

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