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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
12 solves
Submissions (latest 3)
gin

SOLVED!

Sep 21, 11:06 PM

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.

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admin
AlpacaHack 2100
Misc
Welcome🌱
2,213 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🌱
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
12 solves
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
1
Coming soon
2
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3
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4
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Writeups

Writeup for nested eval

baumroll1234

ja
nested eval

2 hours ago

Rows:

Compile time flag checker

Topic: C++Released: Jul 12, 2026

60 solves
Rev
Hard6.5

by

tan90909090

tan90909090

USER

SOLVED AT

dora

2026/08/30 15:51

2026/08/05 10:43

2026/07/31 04:19

2026/07/29 10:57

2026/07/17 06:41

2026/07/16 17:55

2026/07/16 05:18

2026/07/16 02:19

2026/07/14 14:18

2026/07/14 10:22

2026/07/13 21:27

2026/07/13 11:11

2026/07/13 02:06

2026/07/13 00:50

2026/07/12 22:33

2026/07/12 14:59

2026/07/12 14:20

2026/07/12 14:00

2026/07/12 13:51

2026/07/12 13:27

2026/07/12 13:20

2026/07/12 13:04

2026/07/12 11:52

2026/07/12 11:42

2026/07/12 11:26

Rows:

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