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.

Apr 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

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

ptr-yudai

Pwn

Medium

96 solves

tchen

No Content

Web

Easy

187 solves

ark

1️⃣

Misc

Easy

181 solves

ark

Panic

Web

Medium

140 solves

ptr-yudai

AES is dead

Crypto

Medium

95 solves

pppp4649

pacapaca sc

Pwn

Hard

82 solves

rsk0315

Erased Secret

Misc

Medium

88 solves

tan90909090

strange filename

Misc

Easy

157 solves

kanon

wither

Crypto

Medium

112 solves

colza

flag obfuscation

Rev

Medium

101 solves

tchen

One More Login Challenge

Web

Medium

129 solves

serioton

LiteAlpaca

Misc

Easy

140 solves

kurenaif

super_simultaneous_equations

Crypto

Hard

73 solves

tchen

HTML2PNG

Web

Hard

101 solves

shiro

fake-shuffle-proof

Crypto

Easy

117 solves

pppp4649

is NaN?

Misc

Medium

103 solves

tchen

Rate My Alpaca

Web

Medium

91 solves

kakur41

Camelid Match

Crypto

Medium

83 solves

tchen

Image Python

Misc

Medium

81 solves

shiro

multi-xor

Crypto

Hard

62 solves

tchen

Small Image Uploader

Web

Hard

63 solves

shiragi

Unrevealed TXT

Misc

Easy

123 solves

serioton

unheard

Misc

Medium

73 solves

minaminao

permission denied

Misc

Hard

76 solves

minaminao

permission denied 2

Misc

Medium

75 solves

admin

Alpaca++

Misc

Welcome

181 solves

tchen

Alpaca Rangers 2

Web

Easy

157 solves

pppp4649

Small N

Crypto

Easy

120 solves

Want a harder challenge?

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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
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