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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
admin
Baby Alpaca
Misc
Welcome🌱
30 solves
Submissions (latest 3)
mizore-fuyu

SOLVED!

Oct 1, 12:50 AM

shiragi

SOLVED!

Oct 1, 12:44 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🌱
2,235 solves
Upcoming challenges reveal the , , and in advance.
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Aug 2026

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27
tchentchen
RFC100008
Web
Easy🌱
157 solves
28
2501
One More Approval
Crypto
Medium
63 solves
29
2501
zen.zip
Misc
Medium
70 solves
30
2501
Anyrunner
Misc
Medium
68 solves
31
tchentchen
Small Image Uploader 2
Web
Medium
66 solves
1
admin
Día Nacional de la Alpaca
Misc
Welcome🌱
259 solves
2
2501
Password, Please
Misc
Easy🌱
220 solves
3-4
arkark
Long Long Flag Printer 2026
Misc
Medium
97 solves
5
pppp4649pppp4649
Happy Birthday
Crypto
Easy🌱
149 solves
6-8
hiikunzhiikunz
AESAESAESAESAESAES
Crypto
Hard
63 solves
9-10
tchentchen
Not so Pyf**k
Misc
Medium
90 solves
 
tchentchen
Not so Pyf**k
Misc
Medium
90 solves
11-12
baumroll1234
Fermat's Last Theorem
Misc
Medium
86 solves
13-15
tchentchen
True or False 2
Misc
Hard
56 solves
16-17
tchentchen
List Sharing
Web
Medium
88 solves
 
tchentchen
List Sharing
Web
Medium
88 solves
18-20
tan90909090tan90909090
wrong instruction
Rev
Hard
63 solves
21-23
tchentchen
Greetings i18n 2
Web
Hard
57 solves
24-26
tchentchen
Xwitter
Web
Hard
47 solves
27-28
tan90909090tan90909090
Let's analyze system calls
Rev
Medium
57 solves
29-31
tchentchen
Springing
Web
Medium
76 solves
 
tchentchen
Springing
Web
Medium
76 solves
1
admin
QUIZ ALPACASHOCK
Misc
Welcome🌱
144 solves
2
hiikunzhiikunz
base 16-32-64
Misc
Easy🌱
120 solves
3-4
tan90909090tan90909090
Let's Shut Down Linux
Misc
Medium
67 solves
5
baumroll1234
6-8
minaminaominaminao
Bitflip RSA
Crypto
Hard
57 solves

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Writeups

Writeup for what is my pointer 2

lumma

ja
what is my pointer 2

2 hours ago

nirvana

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michikusamichiya

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[AlpacaHack] typhoon-python writeup

gattoartz

Writeup for base 16-32-64

ja

2026/09/26 23:00

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