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)

blackade

SOLVED!

May 21, 12:48 AM

tet3

SOLVED!

May 21, 12:47 AM

doma

SOLVED!

May 21, 12:37 AM

Leaderboard

Period

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🌱

125 solves

serioton

unheard

Misc

Medium

76 solves

minaminao

permission denied

Misc

Hard

78 solves

minaminao

permission denied 2

Misc

Medium

79 solves

admin

Alpaca++

Misc

Welcome🌱

233 solves

tchen

Alpaca Rangers 2

Web

Easy🌱

198 solves

pppp4649

Small N

Crypto

Easy🌱

151 solves

hiikunz

secret-table-2

Web

Medium

142 solves

serioton

do the math

Misc

Medium

112 solves

trimscash

func-array

Pwn

Easy🌱

139 solves

minaminao

permission denied 3

Misc

Medium

110 solves

baumroll1234

Vending Machine

Misc

Easy🌱

170 solves

hiikunz

reused n

Crypto

Medium

112 solves

rsk0315

Bounds Checking

Pwn

Hard

83 solves

serioton

Mirage

Rev

Easy🌱

120 solves

minaminao

hidden service

Misc

Medium

101 solves

tchen

Super Short Python Golf

Misc

Medium

114 solves

minaminao

Equation Cipher

Crypto

Medium

99 solves

tan90909090

curl as a service

Web

Misc

Medium

108 solves

k0080

Please Link This

Pwn

Hard

71 solves

tan90909090

curl as a service 2

Web

Misc

Hard

85 solves

shiragi

Flag for Switch

Web

Easy🌱

138 solves

pppp4649

Small d

Crypto

Medium

95 solves

tchen

Kakuzuke

Web

Medium

90 solves

kakur41

Python:Impossible

Misc

Medium

48 solves

nozokare

Planned topicOne-Time Password

Web

Medium

Coming soon

k0080

Planned topicCUDA

Rev

Hard

Coming soon

rsk0315

Planned topicXSS

Web

Hard

ptr-yudai

Planned topicStack

Pwn

Hard

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Kakuzuke

tadanobutubutu

Kakuzuke

5 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/20 web/Kakuzuke/tchen

tsukuyomi-chan

Kakuzuke

8 hours ago

Writeup for Kakuzuke

goroshirow

Kakuzuke

9 hours ago

Writeup for Emojify

paulayground

Emojify

9 hours ago

Writeup for Small d

tadanobutubutu

Small d

2026/05/19 16:03

Daily AlpacaHackに挑戦するつくよみちゃん 05/19 crypto/small d/pppp4649

tsukuyomi-chan

Small d

2026/05/19 16:00

Writeup for Small d

goroshirow

Small d

2026/05/19 15:08

Writeup for Daily AlpacaHack 5/11-5/17

labpump

curl as a service 2

2026/05/19 12:12

Writeup for Flag for Switch

baumroll1234

Flag for Switch

2026/05/18 22:06

Writeup for Flag for Switch

tadanobutubutu

Flag for Switch

2026/05/18 19:58

Rows:

Python:Impossible

Topic: PythonReleased: May 21, 2026

48 solves

Misc

Medium

kakur41

USER	SOLVED AT
blackade	7 minutes ago
tet3	7 minutes ago
doma	17 minutes ago
kumabear	18 minutes ago
kowerkoint	24 minutes ago
hori	1 hour ago
fulgens	1 hour ago
yoshy	2 hours ago
kakur41	2 hours ago
haihuiliyuyuan	2 hours ago
hiziki	2 hours ago
koufu193	3 hours ago
baloon	3 hours ago
tad	4 hours ago
toomer	4 hours ago
tadanobutubutu	5 hours ago
ntanaka	5 hours ago
nozokare	6 hours ago
serioton	6 hours ago
ykoyama	8 hours ago
nanashiku	8 hours ago
itsuki-t	8 hours ago
iliss-557	8 hours ago
koromaki88	8 hours ago
chara0x	8 hours ago

Rows:

description solves