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

tchen

Super Short Python Golf

Misc

Medium

32 solves

Submissions (latest 3)

shanoit-sano

SOLVED!

May 12, 5:59 PM

panya

SOLVED!

May 12, 5:41 PM

nomeaning

SOLVED!

May 12, 5:25 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.

May 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

shiragi

Unrevealed TXT

Misc

Easy🌱

123 solves

serioton

unheard

Misc

Medium

74 solves

minaminao

permission denied

Misc

Hard

76 solves

minaminao

permission denied 2

Misc

Medium

77 solves

admin

Alpaca++

Misc

Welcome🌱

195 solves

tchen

Alpaca Rangers 2

Web

Easy🌱

170 solves

pppp4649

Small N

Crypto

Easy🌱

127 solves

hiikunz

secret-table-2

Web

Medium

130 solves

serioton

do the math

Misc

Medium

107 solves

trimscash

func-array

Pwn

Easy🌱

123 solves

minaminao

permission denied 3

Misc

Medium

105 solves

baumroll1234

Vending Machine

Misc

Easy🌱

151 solves

hiikunz

reused n

Crypto

Medium

108 solves

rsk0315

Bounds Checking

Pwn

Hard

80 solves

serioton

Mirage

Rev

Easy🌱

105 solves

minaminao

hidden service

Misc

Medium

86 solves

tchen

Super Short Python Golf

Misc

Medium

32 solves

Coming soon

tan90909090

Planned topiccurl

Web

Misc

Medium

k0080

Planned topicProcedure Linkage Table

Pwn

Hard

tan90909090

Planned topiccurl

Web

Misc

Hard

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

Daily AlpacaHackに挑戦するつくよみちゃん 05/12 misc/hidden service/minaminao

tsukuyomi-chan

hidden service

1 hour ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/09 crypto/reused n/hiikunz

tsukuyomi-chan

reused n

2 hours ago

Daily AlpacaHackに挑戦するつくよみちゃん 05/11 rev/mirage/serioton

tsukuyomi-chan

Mirage

2 hours ago

Writeup for hidden service

tadanobutubutu

hidden service

2 hours ago

Writeup for hidden service

goroshirow

hidden service

2 hours ago

Writeup for Mirage

nitcelcius

Mirage

6 hours ago

Writeup for Mirage

tadanobutubutu

Mirage

yesterday

Writeup for Mirage

goroshirow

Mirage

yesterday

Writeup for func-array

nitcelcius

func-array

yesterday

Writeup for Bounds Checking

nozokare

Bounds Checking

2 days ago

Rows:

Super Short Python Golf

Topic: JailReleased: May 13, 2026

32 solves

Misc

Medium

tchen

USER	SOLVED AT
shanoit-sano	2 minutes ago
panya	20 minutes ago
nomeaning	36 minutes ago
nozokare	52 minutes ago
kidman7	1 hour ago
kurgm	1 hour ago
serioton	1 hour ago
baumroll1234	1 hour ago
goroshirow	1 hour ago
ctf-udon	1 hour ago
labpump	2 hours ago
cocoa	2 hours ago
shiro	2 hours ago
onotch	2 hours ago
bono	2 hours ago
nanashiku	2 hours ago
nuhe	2 hours ago
a01sa01to	2 hours ago
umineko	2 hours ago
edwowmath	2 hours ago
mak0tan	2 hours ago
rsk0315	2 hours ago
tadanobutubutu	2 hours ago
toomer	2 hours ago
tad	2 hours ago

Rows:

description solves