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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No solved challenges yet.

Today's Challenge

Submissions (latest 3)

xnmhuveb

SOLVED!

Jul 19, 11:32 AM

despair09

SOLVED!

Jul 19, 10:16 AM

shiragi

SOLVED!

Jul 19, 9:48 AM

Leaderboard

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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.

Jul 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Nano Services

Web

Medium

87 solves

minaminao

Super Short System Exit

Misc

Medium

82 solves

admin

Alpaca Nation

Misc

Welcome🌱

221 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

134 solves

tchen

Lucky Redirect

Web

Easy🌱

125 solves

hiikunz

Renda

Rev

Medium

104 solves

tchen

IP Blocked Secret

Web

Hard

64 solves

minaminao

duplicate entry

Misc

Easy🌱

130 solves

hiikunz

Lazy RSA

Crypto

Medium

100 solves

minaminao

Let's Poly1305!

Crypto

Medium

75 solves

shiragi

private method

Misc

Easy🌱

125 solves

hiikunz

secret-table-3

Web

Medium

82 solves

baumroll1234

A slight mistake

Pwn

Hard

69 solves

tan90909090

Compile time flag checker

Rev

Hard

56 solves

baumroll1234

Redirecting to Login Page

Web

Easy🌱

134 solves

tchen

You've Got Shlex

Misc

Medium

83 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

63 solves

tchen

Beat the Alpaca Lord

Web

Medium

87 solves

pppp4649

biribiri

Crypto

Medium

82 solves

tchen

Greetings CGI

Web

Hard

63 solves

hiikunz

no win func

Pwn

Hard

43 solves

tchen

Planned topicGeneral

Web

Easy🌱

Coming soon

minaminao

Planned topicCache

Web

Hard

tchen

Planned topicPython

Web

Hard

Coming soon

admin

Planned topicWelcome

Misc

Welcome🌱

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for You've Got Shlex (shlex only)

kurimochi

You've Got Shlex

6 hours ago

Writeup for Greetings CGI

baumroll1234

Greetings CGI

12 hours ago

Writeup for You've Got Shlex

nitcelcius

You've Got Shlex

23 hours ago

Writeup for Compile time flag checker

edwowmath

Compile time flag checker

2026/07/18 02:07

Writeup for biribiri

baumroll1234

biribiri

2026/07/17 21:38

Writeup for Beat the Alpaca Lord

baumroll1234

Beat the Alpaca Lord

2026/07/16 21:24

Writeup for You've Got Shlex

tchen

author

You've Got Shlex

2026/07/16 01:15

Writeup for IP Blocked Secret

tchen

author

IP Blocked Secret

2026/07/15 23:53

Writeup for Let's Poly1305! 2

baumroll1234

Let's Poly1305! 2

2026/07/15 16:06

Writeup for Redirecting to Login Page

hiro-1noue

Redirecting to Login Page

2026/07/15 07:24

Rows:

Alpaca Rangers

Topic: LFIReleased: Feb 25, 2026

190 solves

Web

Medium3.0

tchen

USER	SOLVED AT
dadan	2026/07/10 08:44
paper	2026/07/08 01:54
repsej-h	2026/07/04 18:17
s1340175	2026/07/02 10:39
s1340174	2026/07/01 14:49
tozawa	2026/07/01 13:36
mio	2026/07/01 08:30
ayane511	2026/07/01 05:58
yuns	2026/06/30 15:21
keita	2026/06/30 10:31
wow9	2026/06/28 11:58
kobayashi	2026/06/27 02:49
s1340079	2026/06/26 08:30
tai	2026/06/25 10:09
s1340025	2026/06/25 09:37
s1340157	2026/06/25 09:32
s1340207	2026/06/25 09:28
s1340229	2026/06/25 09:27
ka-te	2026/06/25 09:17
king3326	2026/06/25 09:04
s1340003	2026/06/25 08:40
nagiaaa	2026/06/25 08:08
umachaba	2026/06/20 03:06
tadanobutubutu	2026/06/19 21:12
mustafa	2026/06/19 20:00