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

Submissions (latest 3)

omame3

SOLVED!

Mar 6, 11:39 AM

tab

SOLVED!

Mar 6, 11:18 AM

mizore-fuyu

SOLVED!

Mar 6, 11:16 AM

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.

Mar 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

kakur41

Alpaca Quest

Rev

Medium

103 solves

minaminao

hit-and-hit

Misc

Medium

78 solves

tchen

Alpaca Rangers

Web

Medium

128 solves

kurenaif

One Byte Padding Oracle Attack

Crypto

Hard

67 solves

tchen

Rock Paper Scissors Lizard Spock

Web

Hard

85 solves

minaminao

pyjs

Misc

Hard

76 solves

admin

Alpaca meets QR

Misc

Welcome

163 solves

kakur41

Bars

Web

Easy

165 solves

tan90909090

glibc's secret function

Rev

Easy

129 solves

minaminao

Flag Printer 2026

Misc

Easy

127 solves

tchen

Alert my Flag

Web

Medium

98 solves

mora

magic number

Misc

Medium

65 solves

theoremoon

Planned topicRNG

Crypto

Hard

ark

Planned topicJavaScript

Misc

Hard

minaminao

Planned topicEnvironment Variable

Misc

Medium

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Author's Writeup for Flag Printer 2026 minaminao author ja Flag Printer 2026 23 hours ago
Writeup for Bars baumroll1234 ja Bars 2 days ago
Writeup for pyjs rqda en pyjs 4 days ago
Writeup for pyjs tchen en pyjs 4 days ago
Writeup for pyjs hiikunz ja pyjs 4 days ago
Writeup for pyjs rsk0315 ja pyjs 5 days ago
Writeup for Daily AlpacaHack 2/22-2/28 kakur41 author ja Noob programmer +6 5 days ago
Writeup for pyjs toomer en pyjs 5 days ago
Writeup for One Byte Padding Oracle Attack baumroll1234 ja One Byte Padding Oracle Attack 5 days ago
Writeup for pyjs baumroll1234 ja pyjs 5 days ago

Rows:

shellcode-101

Topic: ShellcodeReleased: Jan 29, 2026

120 solves

Pwn

Medium

Author:

k0080

Controll alpaca

shellcode-101.tar.gz

description solves writeups