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

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No solved challenges yet.

Today's Challenge

Submissions (latest 3)

nanashiku

SOLVED!

Jun 28, 5:37 PM

rsk0315

SOLVED!

Jun 28, 5:20 PM

toomer

SOLVED!

Jun 28, 4:54 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.

Jun 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

admin

Half-Year Recap

Misc

Welcome🌱

252 solves

minaminao

Cache Me If You Can

Web

Easy🌱

212 solves

minaminao

vm1

Misc

Medium

102 solves

pppp4649

Small e

Crypto

Easy🌱

141 solves

minaminao

RPS GAME

Misc

Crypto

Medium

100 solves

nozokare

Flag for localhost

Web

Easy🌱

179 solves

tan90909090

C++ flag checker

Rev

Hard

88 solves

shiragi

Guess IP

Misc

Easy🌱

147 solves

nozokare

A Piece of DHKE

Crypto

Medium

83 solves

shiragi

chmod-swapper

Misc

Medium

87 solves

tchen

Alpaca Certification

Web

Easy🌱

164 solves

rsk0315

Floating Equality

Misc

Medium

92 solves

pppp4649

Elliptic Equation

Crypto

Hard

61 solves

tchen

CAuth

Web

Hard

71 solves

minaminao

SITE/2

Web

Easy🌱

125 solves

tan90909090

Xored PNG

Misc

Medium

88 solves

tchen

Looks like Alpacahack

Web

Medium

86 solves

shiragi

Catrunner 2

Misc

Medium

108 solves

minaminao

Flag Printer 20XX

Misc

Hard

64 solves

nozokare

xorshift521

Crypto

Hard

54 solves

k0080

what-is-my-size

Pwn

Hard

66 solves

minaminao

✌️✌️✌️

Crypto

Easy🌱

91 solves

tchen

Secret Renderer

Web

Medium

83 solves

kanon

honk the klaxon

Crypto

Medium

58 solves

colza

voyage

Misc

Easy🌱

93 solves

rsk0315

Decimal float 101.0

Misc

Medium

65 solves

bubu

Style Your Alpaca

Web

Hard

54 solves

pppp4649

Only forward

Pwn

Hard

54 solves

tchen

Nano Services

Web

Medium

17 solves

minaminao

Planned topicPython

Misc

Medium

admin

Planned topicWelcome

Misc

Welcome🌱

hiikunz

Planned topicMathematics

Crypto

Easy🌱

tchen

Planned topicGeneral

Web

Easy🌱

hiikunz

Planned topicJavaScript

Rev

Medium

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Only forward

baumroll1234

Only forward

1 hour ago

Writeup for Only forward: 3 Solutions

goroshirow

Only forward

3 hours ago

Writeup for Only forward

nitcelcius

Only forward

3 hours ago

Writeup for Daily AlpacaHack 6/21-6/27

kakur41

Decimal float 101.0

5 hours ago

Writeup for Daily AlpacaHack 6/14-6/20

kakur41

SITE/2

6 hours ago

Writeup for Daily AlpacaHack 6/7-6/13

kakur41

C++ flag checker

6 hours ago

Writeup for Daily AlpacaHack 5/31-6/6

kakur41

Half-Year Recap

6 hours ago

Writeup for Daily AlpacaHack 5/24-5/30

kakur41

AlpacaForm

7 hours ago

Writeup for Daily AlpacaHack 5/17-5/23

kakur41

author

Python:Impossible

13 hours ago

Writeup for Daily AlpacaHack 5/10-5/16

kakur41

Bounds Checking

14 hours ago

Rows:

Nano Services

Topic: XSSReleased: Jun 29, 2026

17 solves

Web

Medium

tchen

USER	SOLVED AT
nanashiku	1 hour ago
rsk0315	1 hour ago
toomer	2 hours ago
syn9	2 hours ago
roaris	2 hours ago
bubu	2 hours ago
cat22222	2 hours ago
kakur41	2 hours ago
kurgm	2 hours ago
a01sa01to	2 hours ago
serioton	3 hours ago
cocoa	3 hours ago
hiikunz	3 hours ago
toto1010orange	3 hours ago
tsuji1	3 hours ago
umineko	3 hours ago
panya	3 hours ago

Rows:

description solves