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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.

View challenge
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
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:

Cache Me If You Can

Topic: CacheReleased: Jun 2, 2026

283 solves
Web
Easy🌱3.0

by

minaminao

minaminao

USER

SOLVED AT

kurihara

2026/09/15 02:45

2026/09/14 02:28

2026/09/11 02:40

2026/09/09 16:12

2026/09/08 13:53

2026/09/05 23:41

2026/09/03 04:44

2026/09/02 18:25

2026/09/01 18:46

2026/08/28 13:30

2026/08/28 08:47

2026/08/28 07:07

2026/08/25 07:51

2026/08/24 12:13

2026/08/23 05:36

2026/08/22 11:34

2026/08/22 11:21

2026/08/16 08:04

2026/08/10 17:06

2026/08/09 14:29

2026/08/08 18:57

2026/08/07 20:24

2026/08/07 19:01

2026/08/05 05:45

2026/08/01 05:40

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