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)

embe221ed

SOLVED!

Jul 26, 8:17 PM

bubu

SOLVED!

Jul 26, 7:45 PM

logdav

SOLVED!

Jul 26, 7:09 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.

Jul 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Nano Services

Web

Medium

88 solves

minaminao

Super Short System Exit

Misc

Medium

83 solves

admin

Alpaca Nation

Misc

Welcome🌱

252 solves

hiikunz

Flag is A+B

Crypto

Easy🌱

152 solves

tchen

Lucky Redirect

Web

Easy🌱

147 solves

hiikunz

Renda

Rev

Medium

113 solves

tchen

IP Blocked Secret

Web

Hard

66 solves

minaminao

duplicate entry

Misc

Easy🌱

145 solves

hiikunz

Lazy RSA

Crypto

Medium

104 solves

minaminao

Let's Poly1305!

Crypto

Medium

76 solves

shiragi

private method

Misc

Easy🌱

139 solves

hiikunz

secret-table-3

Web

Medium

86 solves

baumroll1234

A slight mistake

Pwn

Hard

71 solves

tan90909090

Compile time flag checker

Rev

Hard

56 solves

baumroll1234

Redirecting to Login Page

Web

Easy🌱

155 solves

tchen

You've Got Shlex

Misc

Medium

87 solves

minaminao

Let's Poly1305! 2

Crypto

Hard

64 solves

tchen

Beat the Alpaca Lord

Web

Medium

91 solves

pppp4649

biribiri

Crypto

Medium

86 solves

tchen

Greetings CGI

Web

Hard

71 solves

hiikunz

no win func

Pwn

Hard

74 solves

tchen

Alpaca Blog

Web

Easy🌱

115 solves

tan90909090

NOP Variant

Rev

Misc

Medium

65 solves

ark

jinjail

Misc

Hard

43 solves

tchen

True or False

Misc

Medium

69 solves

minaminao

Cache Me If You Can 2

Web

Hard

51 solves

k0080

what-is-my-pointer

Pwn

Hard

45 solves

tchen

Greetings i18n

Web

Hard

45 solves

tchen

RFC100008

Web

Easy🌱

32 solves

Coming soon

admin

Planned topicWelcome

Misc

Welcome🌱

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for no win func

nirvana

no win func

8 hours ago

Writeup for what-is-my-pointer

nirvana

what-is-my-pointer

20 hours ago

Writeup for Cache Me If You Can 2 (with PowerShell)

nitcelcius

Cache Me If You Can 2

2026/07/25 14:14

Writeup for True or False

baumroll1234

True or False

2026/07/23 20:57

Writeup for True or False

nirvana

True or False

2026/07/23 15:05

Writeup for jinjail

goroshirow

jinjail

2026/07/23 07:16

Writeup for NOP Variant

umineko

NOP Variant

2026/07/22 04:11

Daily AlpacaHackに挑戦するつくよみちゃん07/21/NOP Variant/tan90909090

tsukuyomi-chan

NOP Variant

2026/07/21 16:33

Writeup for Alpaca Blog

nirvana

Alpaca Blog

2026/07/21 13:38

Writeup for Alpaca Blog

baumroll1234

Alpaca Blog

2026/07/20 21:53

Rows:

RFC100008

Topic: HTTPReleased: Jul 27, 2026

32 solves

Web

Easy🌱3.0

tchen

USER	SOLVED AT
embe221ed	17 minutes ago
bubu	49 minutes ago
logdav	1 hour ago
cqbtq	2 hours ago
itsuki-t	2 hours ago
toomer	3 hours ago
goat-antony2008	3 hours ago
naitem	4 hours ago
kakur41	4 hours ago
0266st	4 hours ago
shiragi	4 hours ago
trimscash	4 hours ago
hiikunz	4 hours ago
gin	4 hours ago
toto1010orange	4 hours ago
unubore	4 hours ago
syougotea	4 hours ago
mak0tan	4 hours ago
umineko	5 hours ago
edwowmath	5 hours ago
mti	5 hours ago
baumroll1234	5 hours ago
nanashiku	5 hours ago
panya	5 hours ago
kurgm	5 hours ago

Rows:

description solves