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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
tan90909090tan90909090
wrong instruction
Rev
Hard
25 solves
Submissions (latest 3)
a01sa01to
a01sa01to

SOLVED!

Aug 18, 6:00 AM

koufu193

SOLVED!

Aug 18, 5:39 AM

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🌱
2,131 solves
Upcoming challenges reveal the , , and in advance.
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Aug 2026

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27
tchentchen
RFC100008
Web
Easy🌱
132 solves
28
2501
One More Approval
Crypto
Medium
61 solves
29
2501
zen.zip
Misc
Medium
67 solves
30
2501
Anyrunner
Misc
Medium
59 solves
31
tchentchen
Small Image Uploader 2
Web
Medium
61 solves
1
admin
Día Nacional de la Alpaca
Misc
Welcome🌱
202 solves
2
2501
Password, Please
Misc
Easy🌱
163 solves
3-4
arkark
Long Long Flag Printer 2026
Misc
Medium
85 solves
5
pppp4649pppp4649
Happy Birthday
Crypto
Easy🌱
108 solves
6-8
hiikunzhiikunz
AESAESAESAESAESAES
Crypto
Hard
55 solves
9-10
tchentchen
Not so Pyf**k
Misc
Medium
75 solves
 
tchentchen
Not so Pyf**k
Misc
Medium
75 solves
11-12
baumroll1234
Fermat's Last Theorem
Misc
Medium
71 solves
13-15
tchentchen
True or False 2
Misc
Hard
46 solves
16-17
tchentchen
List Sharing
Web
Medium
55 solves
 
tchentchen
List Sharing
Web
Medium
55 solves
18-20
tan90909090tan90909090
wrong instruction
Rev
Hard
25 solves
21-23
tchentchen
Planned topicPython
Web
Hard
24-26
Planned topicXSS
Web
Hard
27
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28
Coming soon
29
Coming soon
30
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31
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1
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2
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3
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4
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Writeups

power

Writeup for Password, Please

power

ja
Password, Please

2 hours ago

power

Writeup for Read Assembly

ja

2026/08/14 05:59

Writeup for Fermat's Last Theorem

author
ja

2026/08/13 13:59

Rows:

SwapSwap

Topic: PythonReleased: Jan 9, 2026

336 solves
Misc
Easy🌱2.0

by

hiikunz

hiikunz

If they're swapped twice, they'll go back to how they were, right?

server.py

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