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)

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.

Mar 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

kakur41

Bars

Web

Easy

318 solves

tan90909090

glibc's secret function

Rev

Easy

206 solves

minaminao

Flag Printer 2026

Misc

Easy

215 solves

tchen

Alert my Flag

Web

Medium

180 solves

mora

magic number

Misc

Medium

129 solves

theoremoon

high and low

Crypto

Hard

91 solves

ark

guess.js

Misc

Hard

107 solves

minaminao

FLAG OVER

Misc

Medium

120 solves

ark

💯

Misc

Medium

120 solves

pppp4649

Find XOR key

Crypto

Easy

159 solves

colza

kappa overflow

Pwn

Medium

127 solves

tchen

Another Login Challenge

Web

Medium

135 solves

asusn

Heuristic IPPON

Misc

Easy

173 solves

minaminao

flag.txt

Misc

Hard

115 solves

pppp4649

The future path

Crypto

Medium

94 solves

tchen

Free Coupon

Web

Medium

142 solves

ark

PPPPParse

Misc

Medium

101 solves

rsk0315

Flags for the FLAG

Misc

Easy

155 solves

colza

canary leak

Pwn

Medium

111 solves

chocorusk

Alpacker

Rev

Hard

81 solves

k0080

vuln4vuln

Pwn

Hard

100 solves

kanon

bloom

Crypto

Medium

91 solves

tchen

What's Next

Web

Medium

115 solves

kurenaif

crypto_666

Crypto

Medium

108 solves

tan90909090

Optimized expression

Rev

Easy

120 solves

minaminao

encrypted-p

Crypto

Medium

105 solves

hiikunz

EncodeDecode

Misc

Hard

88 solves

tchen

Dot Chain

Misc

Hard

87 solves

tchen

Tar Uploader

Web

Medium

105 solves

blackade

silence

Misc

Medium

100 solves

admin

OSINT

Misc

Welcome

384 solves

tchen

Message For You

Web

Easy

242 solves

pppp4649

You are my friend

Crypto

Easy

191 solves

hiikunz

Impossible Puzzle

Web

Easy

228 solves

kanon

The Horn

Crypto

Medium

107 solves

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for reused n baumroll1234 ja reused n 40 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:

Vending Machine

Topic: PythonReleased: May 8, 2026

133 solves

Misc

Easy

baumroll1234