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.

Not a Competition

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

Solution Sharing Rules

Sharing solutions is allowed only after 24 hours have passed since release.

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Today's Challenge

Submissions (latest 3)

roaris

SOLVED!

May 17, 3:45 AM

kumabear

SOLVED!

May 17, 3:33 AM

now4est

SOLVED!

May 17, 3:20 AM

Leaderboard

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Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

Upcoming challenges reveal the , , and in advance.

May 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

shiragi

Unrevealed TXT

Misc

Easy🌱

124 solves

serioton

unheard

Misc

Medium

75 solves

minaminao

permission denied

Misc

Hard

77 solves

minaminao

permission denied 2

Misc

Medium

77 solves

admin

Alpaca++

Misc

Welcome🌱

212 solves

tchen

Alpaca Rangers 2

Web

Easy🌱

186 solves

pppp4649

Small N

Crypto

Easy🌱

141 solves

hiikunz

secret-table-2

Web

Medium

139 solves

serioton

do the math

Misc

Medium

109 solves

trimscash

func-array

Pwn

Easy🌱

134 solves

minaminao

permission denied 3

Misc

Medium

107 solves

baumroll1234

Vending Machine

Misc

Easy🌱

161 solves

hiikunz

reused n

Crypto

Medium

111 solves

rsk0315

Bounds Checking

Pwn

Hard

83 solves

serioton

Mirage

Rev

Easy🌱

116 solves

minaminao

hidden service

Misc

Medium

98 solves

tchen

Super Short Python Golf

Misc

Medium

108 solves

minaminao

Equation Cipher

Crypto

Medium

97 solves

tan90909090

curl as a service

Web

Misc

Medium

94 solves

k0080

Please Link This

Pwn

Hard

61 solves

tan90909090

curl as a service 2

Web

Misc

Hard

38 solves

shiragi

Planned topicUser Agent

Web

Easy🌱

Coming soon

tchen

Planned topicLFI

Web

Medium

Coming soon

k0080

Planned topicCUDA

Rev

Hard

Coming soon

ptr-yudai

Planned topicStack

Pwn

Hard

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Please Link This

baumroll1234

Please Link This

6 hours ago

Writeup for Please Link This

goroshirow

Please Link This

12 hours ago

Writeup for Daily AlpacaHack 5/4-5/10

labpump

reused n

14 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/15 web-misc/curl as a service/tan90909090

tsukuyomi-chan

curl as a service

2026/05/15 18:05

Writeup for curl as a service

goroshirow

curl as a service

2026/05/15 15:03

Writeup for Equation Cipher

goroshirow

Equation Cipher

2026/05/15 04:19

Writeup for Equation Cipher

baumroll1234

Equation Cipher

2026/05/14 21:52

Daily AlpacaHackに挑戦するつくよみちゃん 05/14 crypto/Equation Cipher/minaminao

tsukuyomi-chan

Equation Cipher

2026/05/14 18:27

Writeup for Equation Cipher

nozokare

Equation Cipher

2026/05/14 16:45

Writeup for Equation Cipher

tadanobutubutu

Equation Cipher

2026/05/14 15:07

Rows:

curl as a service 2

Topic: curlReleased: May 17, 2026

38 solves

Web Misc

Hard

tan90909090

USER	SOLVED AT
roaris	11 minutes ago
kumabear	23 minutes ago
now4est	36 minutes ago
cocoa	36 minutes ago
kurgm	1 hour ago
nomeaning	1 hour ago
cfba82eb	2 hours ago
tet3	2 hours ago
pppp4649	3 hours ago
logdav	3 hours ago
baloon	3 hours ago
onotch	3 hours ago
koufu193	3 hours ago
fulgens	4 hours ago
n0v4	5 hours ago
kowerkoint	5 hours ago
baumroll1234	6 hours ago
hiikunz	6 hours ago
bono	6 hours ago
koromaki88	8 hours ago
bsvac	10 hours ago
nanashiku	10 hours ago
turty	10 hours ago
goroshirow	11 hours ago
rsk0315	11 hours ago

Rows:

description solves