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.

Solve stats

/161

No solved challenges yet.

Today's Challenge

Submissions (latest 3)

cocoa

SOLVED!

May 9, 4:21 PM

kurgm

SOLVED!

May 9, 4:18 PM

toomer

SOLVED!

May 9, 4:05 PM

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.

Feb 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

keymoon

git gc

Misc

Medium

160 solves

chocorusk

ToyPQC

Crypto

Hard

112 solves

tchen

No JS

Web

Medium

138 solves

k0080

shellcode-101

Pwn

Medium

143 solves

yu212

Linear Coffee Generator

Crypto

Hard

118 solves

ark

optimal-sort

Misc

Hard

107 solves

admin

Camelidae

Misc

Welcome

404 solves

minaminao

Substance

Crypto

Easy

253 solves

tan90909090

read-a-binary

Rev

Easy

239 solves

tchen

Magic Engine

Web

Easy

283 solves

kanon

RRe_Time_Limiter

Crypto

Medium

187 solves

minaminao

The World

Misc

Easy

199 solves

tan90909090

misdirection

Rev

Medium

169 solves

hiikunz

Compressor

Misc

Hard

114 solves

tchen

Plz Login

Web

Medium

235 solves

k0080

Alpaca-Llama Ranch

Pwn

Hard

133 solves

ark

destructuring

Misc

Easy

151 solves

hiikunz

AAAAAAAAEEEEEEEESSSSSSSS

Crypto

Medium

129 solves

minaminao

nc magic

Misc

Medium

142 solves

hiikunz

simple ROP

Pwn

Hard

122 solves

tchen

You are being redirected

Web

Medium

121 solves

kakur41

Alpaillier

Crypto

Medium

126 solves

rsk0315

wages of sin()

Rev

Misc

Hard

96 solves

k0080

Disappeared

Pwn

Medium

120 solves

minaminao

Pickle Loader

Misc

Medium

122 solves

rsk0315

Dancing Cursor

Misc

Rev

Medium

112 solves

pppp4649

CopperCopperCopper

Crypto

Hard

96 solves

k0080

Noob programmer

Pwn

Hard

108 solves

kakur41

Alpaca Quest

Rev

Medium

121 solves

minaminao

hit-and-hit

Misc

Hard

89 solves

tchen

Alpaca Rangers

Web

Medium

156 solves

kurenaif

One Byte Padding Oracle Attack

Crypto

Hard

76 solves

tchen

Rock Paper Scissors Lizard Spock

Web

Hard

103 solves

minaminao

pyjs

Misc

Hard

86 solves

admin

Alpaca meets QR

Misc

Welcome

329 solves

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for reused n baumroll1234 ja reused n 29 minutes ago
Writeup for Daily AlpacaHack 5/3-5/9 kakur41 ja reused n +6 1 hour ago
Writeup for reused n goroshirow ja reused n 1 hour ago
Writeup for Vending Machine baumroll1234 author ja Vending Machine 3 hours ago
Writeup for Vending Machine tadanobutubutu ja Vending Machine 6 hours ago
Daily AlpacaHackに挑戦するつくよみちゃん 05/08 misc/Vending Machine/baumroll1234 tsukuyomi-chan ja Vending Machine 7 hours ago
Daily AlpacaHackに挑戦するつくよみちゃん 05/07 misc/Permission Denied 3/minaminao tsukuyomi-chan ja permission denied 3 7 hours ago
Writeup for Vending Machine nozokare ja Vending Machine 8 hours ago
Writeup for permission denied 3 nozokare ja permission denied 3 8 hours ago
Writeup for func-array nozokare ja func-array 8 hours ago

Rows:

crypto_666

Topic: PrimeReleased: Mar 25, 2026

108 solves

Crypto

Medium

kurenaif

USER	SOLVED AT
sp1n0z4	last week
kurenaif	2 weeks ago
muhammed	2 weeks ago
paper	4 weeks ago
yu212	last month
poterin112	last month
novemura	last month
youle	last month
urneighbor1	last month
yoshykai	last month
haihuiliyuyuan	last month
nuhe	last month
elure	last month
8448	last month
tab4	last month
hgfbrz	last month
reyon	last month
n0v4	last month
saranrappu0831	last month
ctf-udon	last month
thayato	last month
chocorusk	last month
tet3	last month
pekyh	last month
alice-terui	last month