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Daily AlpacaHack

A daily CTF challenge with a fun new puzzle every day

What is Daily AlpacaHack?

We publish one simple, beginner-friendly or educational CTF challenge every day!

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Solve within 24 hours of release to appear on the leaderboard.

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Today's Challenge
pppp4649pppp4649
Only forward
Pwn
Hard
23 solves
Submissions (latest 3)
baumroll1234

SOLVED!

Jun 27, 7:46 PM

lluuiiggee

SOLVED!

Jun 27, 6:34 PM

kakur41
kakur41

SOLVED!

Jun 27, 5:36 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🌱
1,920 solves
Upcoming challenges reveal the , , and in advance.
Prev

Jun 2026

Next
Solved
Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
1
admin
Half-Year Recap
Misc
Welcome🌱
248 solves
2
minaminaominaminao
Cache Me If You Can
Web
Easy🌱
209 solves
3
minaminaominaminao
vm1
Misc
Medium
101 solves
4
pppp4649pppp4649
Small e
Crypto
Easy🌱
140 solves
5
minaminaominaminao
RPS GAME
Misc
Crypto
Medium
100 solves
6
nozokare
Flag for localhost
Web
Easy🌱
176 solves
7
tan90909090tan90909090
C++ flag checker
Rev
Hard
87 solves
8
shiragishiragi
Guess IP
Misc
Easy🌱
145 solves
9
nozokare
A Piece of DHKE
Crypto
Medium
83 solves
10
shiragishiragi
chmod-swapper
Misc
Medium
86 solves
11
tchentchen
Alpaca Certification
Web
Easy🌱
162 solves
12
rsk0315
Floating Equality
Misc
Medium
92 solves
13
pppp4649pppp4649
Elliptic Equation
Crypto
Hard
61 solves
14
tchentchen
CAuth
Web
Hard
70 solves
15
minaminaominaminao
SITE/2
Web
Easy🌱
123 solves
16
tan90909090tan90909090
Xored PNG
Misc
Medium
88 solves
17
tchentchen
Looks like Alpacahack
Web
Medium
85 solves
18
shiragishiragi
Catrunner 2
Misc
Easy🌱
108 solves
19
minaminaominaminao
Flag Printer 20XX
Misc
Medium
63 solves
20
nozokare
xorshift521
Crypto
Hard
54 solves
21
k0080k0080
what-is-my-size
Pwn
Hard
65 solves
22
minaminaominaminao
✌️✌️✌️
Crypto
Easy🌱
89 solves
23
tchentchen
Secret Renderer
Web
Medium
82 solves
24
kanonkanon
honk the klaxon
Crypto
Medium
58 solves
25
colza
voyage
Misc
Easy🌱
91 solves
26
rsk0315
Decimal float 101.0
Misc
Medium
64 solves
27
bubububu
Style Your Alpaca
Web
Hard
53 solves
28
pppp4649pppp4649
Only forward
Pwn
Hard
23 solves
29
Coming soon
30
Coming soon
1
admin
Planned topicWelcome
Misc
Welcome🌱
2
hiikunzhiikunz
Planned topicMathematics
Crypto
Easy🌱
3
Coming soon
4
hiikunzhiikunz
Planned topicJavaScript
Rev
Medium
5
Coming soon

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Writeups

Writeup for flag obfuscation

colza

author
ja
flag obfuscation

50 minutes ago

Writeup for voyage

colza

author
ja
voyage

51 minutes ago

Daily AlpacaHackに挑戦するつくよみちゃん06/28/Style Your Alpaca/bubu

tsukuyomi-chan

ja
Style Your Alpaca

3 hours ago

bubu

Writeup for Style Your Alpaca

bubu

author
en
Style Your Alpaca

3 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/15/SITE/2/minaminao

tsukuyomi-chan

ja
SITE/2

8 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/14/CAuth/tchen

tsukuyomi-chan

ja
CAuth

9 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/13/Elliptic Equation/pppp4649

tsukuyomi-chan

ja
Elliptic Equation

11 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/12/Floating Equality/rsk0315

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ja
Floating Equality

12 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 06/26/Decimal float 101.0/rsk0315

tsukuyomi-chan

ja
Decimal float 101.0

2026/06/26 19:11

nitcelcius

Writeup for Decimal float 101.0

nitcelcius

ja
Decimal float 101.0

2026/06/26 16:30

Rows:

Guess IP

Topic: NetworkReleased: Jun 8, 2026

145 solves
Misc
Easy🌱3.5

by

shiragi

shiragi

Try to guess the IP from within 10.0.0.1 to 10.255.255.254! (AI-translated)

guess-ip.tar.gz

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