Daily AlpacaHack

A CTF challenge series with fun puzzles to enjoy every day

What is Daily AlpacaHack?

We regularly publish simple, beginner-friendly or educational CTF challenges!

Join Anytime

Solve each challenge within its time window 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 the challenge period has ended.

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Today's Challenge

Submissions (latest 3)

goroshirow

SOLVED!

Aug 19, 2:00 AM

pppp4649

SOLVED!

Aug 19, 12:51 AM

kakur41

SOLVED!

Aug 18, 8:38 PM

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.

Aug 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

RFC100008

Web

Easy🌱

133 solves

2501

One More Approval

Crypto

Medium

61 solves

2501

zen.zip

Misc

Medium

67 solves

2501

Anyrunner

Misc

Medium

59 solves

tchen

Small Image Uploader 2

Web

Medium

61 solves

admin

Día Nacional de la Alpaca

Misc

Welcome🌱

204 solves

2501

Password, Please

Misc

Easy🌱

165 solves

3-4

ark

Long Long Flag Printer 2026

Misc

Medium

87 solves

pppp4649

Happy Birthday

Crypto

Easy🌱

110 solves

6-8

hiikunz

AESAESAESAESAESAES

Crypto

Hard

55 solves

9-10

tchen

Not so Pyf**k

Misc

Medium

76 solves

tchen

Not so Pyf**k

Misc

Medium

76 solves

11-12

baumroll1234

Fermat's Last Theorem

Misc

Medium

73 solves

13-15

tchen

True or False 2

Misc

Hard

46 solves

16-17

tchen

List Sharing

Web

Medium

60 solves

tchen

List Sharing

Web

Medium

60 solves

18-20

tan90909090

wrong instruction

Rev

Hard

38 solves

21-23

tchen

Planned topicPython

Web

Hard

24-26

tchen

Planned topicXSS

Web

Hard

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for Leaked Flag Checker

power

Leaked Flag Checker

14 hours ago

Writeup for Password, Please

power

Password, Please

23 hours ago

Writeup for List Sharing

baumroll1234

List Sharing

2026/08/17 20:44

Writeup for Ruby Flag Checker

haruhana

Ruby Flag Checker

2026/08/16 03:34

Writeup for True or False 2

baumroll1234

True or False 2

2026/08/16 00:09

Writeup for True or False 2

rsk0315

True or False 2

2026/08/15 15:03

Writeup for Read Assembly

power

Read Assembly

2026/08/14 05:59

Writeup for Fermat's Last Theorem

baumroll1234

author

Fermat's Last Theorem

2026/08/13 13:59

Writeup for Fermat's Last Theorem

toshiconner

Fermat's Last Theorem

2026/08/12 23:48

Writeup for I wanna be the Admin

haruhana

I wanna be the Admin

2026/08/12 02:39

Rows:

Renda

Topic: JavaScriptReleased: Jul 4, 2026

127 solves

Rev

Medium3.0

hiikunz