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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!

Join Anytime

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

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Discussion with friends or AI is welcome (account sharing is prohibited).

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Today's Challenge
minaminaominaminao
hidden service
Misc
Medium
23 solves
Submissions (latest 3)
kentaro1043

SOLVED!

May 11, 4:26 PM

bn256

SOLVED!

May 11, 4:13 PM

goroshirow

SOLVED!

May 11, 4:10 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🌱
1,765 solves
Upcoming challenges reveal the , , and in advance.
Prev

May 2026

Next
Solved
Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
27
shiragishiragi
Unrevealed TXT
Misc
Easy🌱
123 solves
28
seriotonserioton
unheard
Misc
Medium
74 solves
29
minaminaominaminao
permission denied
Misc
Hard
76 solves
30
minaminaominaminao
permission denied 2
Misc
Medium
77 solves
1
admin
Alpaca++
Misc
Welcome🌱
189 solves
2
tchentchen
Alpaca Rangers 2
Web
Easy🌱
164 solves
3
pppp4649pppp4649
Small N
Crypto
Easy🌱
126 solves
4
hiikunzhiikunz
secret-table-2
Web
Medium
123 solves
5
seriotonserioton
do the math
Misc
Medium
104 solves
6
trimscashtrimscash
func-array
Pwn
Easy🌱
121 solves
7
minaminaominaminao
permission denied 3
Misc
Medium
105 solves
8
baumroll1234
Vending Machine
Misc
Easy🌱
148 solves
9
hiikunzhiikunz
reused n
Crypto
Medium
106 solves
10
rsk0315
Bounds Checking
Pwn
Hard
79 solves
11
seriotonserioton
Mirage
Rev
Easy🌱
98 solves
12
minaminaominaminao
hidden service
Misc
Medium
23 solves
13
tchentchen
Planned topicJail
Misc
Medium
14
Coming soon
15
tan90909090tan90909090
Planned topicTBA
Web
Misc
Medium
16
k0080k0080
Planned topicProcedure Linkage Table
Pwn
Hard
17
tan90909090tan90909090
Planned topicTBA
Web
Misc
Hard
18
shiragishiragi
Planned topicUser Agent
Web
Easy🌱
19
tchentchen
Planned topicLFI
Web
Medium
20
Coming soon
21
Coming soon
22
Coming soon
23
Coming soon
24
k0080k0080
Planned topicCUDA
Rev
Hard
25
Coming soon
26
Coming soon
27
Coming soon
28
Coming soon
29
Coming soon
30
Coming soon
31
ptr-yudaiptr-yudai
Planned topicStack
Pwn
Hard

Want a harder challenge?

Go to B-SIDE

Writeups

tadanobutubutu

Writeup for Mirage

tadanobutubutu

ja
Mirage

3 hours ago

Writeup for Mirage

goroshirow

ja
Mirage

3 hours ago

nitcelcius

Writeup for func-array

nitcelcius

ja
func-array

3 hours ago

Writeup for Bounds Checking

nozokare

ja
Bounds Checking

yesterday

Writeup for reused n

nozokare

ja
reused n

yesterday

Writeup for Bounds Checking

baumroll1234

ja
Bounds Checking

yesterday

tadanobutubutu

Writeup for Bounds Checking

tadanobutubutu

ja
Bounds Checking

yesterday

Writeup for Bounds Checking

goroshirow

ja
Bounds Checking

yesterday

y8w3ly

Writeup for reused n

y8w3ly

en
reused n

yesterday

yusukekato

AlpacaHackで始めるCTF入門8：初めてのDaily AlpacaHackに挑戦

yusukekato

ja
Vending Machine

yesterday

Rows:

Unrevealed TXT

Topic: DNSReleased: Apr 27, 2026

123 solves
Misc
Easy🌱

by

shiragi

shiragi

Writeups

Daily AlpacaHackに挑戦するつくよみちゃん 04/27 misc/Unevealed TXT/shiragi

tsukuyomi-chan

ja

2 weeks ago

tadanobutubutu

Writeup for Unrevealed TXT

tadanobutubutu

ja

last week

kakur41

Writeup for Daily AlpacaHack 4/26-5/2

kakur41

ja

2 days ago

descriptionsolveswriteups