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)

onotch

SOLVED!

Sep 26, 12:58 PM

sniperthrilla

SOLVED!

Sep 26, 11:02 AM

alice

SOLVED!

Sep 26, 8:50 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.

Sep 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Springing

Web

Medium

74 solves

admin

QUIZ ALPACASHOCK

Misc

Welcome🌱

136 solves

hiikunz

base 16-32-64

Misc

Easy🌱

110 solves

3-4

tan90909090

Let's Shut Down Linux

Misc

Medium

67 solves

baumroll1234

Vending Machine: Revised Version

Misc

Easy🌱

90 solves

6-8

minaminao

Bitflip RSA

Crypto

Hard

56 solves

minaminao

Bitflip RSA

Crypto

Hard

56 solves

9-11

minaminao

＼^o^／

Misc

Hard

44 solves

12-13

tan90909090

sin function vs. fsin instruction

Rev

Misc

Medium

55 solves

14-15

tan90909090

integer division

Misc

Medium

72 solves

16-18

edwowmath

neighboRhood_diStAnce

Crypto

Hard

42 solves

19-21

hiikunz

nested eval

Misc

Hard

50 solves

hiikunz

nested eval

Misc

Hard

50 solves

22-24

2501

The 3rd

Crypto

Hard

36 solves

25-26

haihuiliyuyuan

typhoon-pythoon

Rev

Medium

41 solves

27-29

k0080

Planned topiclibc

Pwn

Hard

k0080

Planned topiclibc

Pwn

Hard

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for The 3rd

baumroll1234

The 3rd

2026/09/24 21:08

Small Image Uploader 2 Writeup

sota70

Small Image Uploader 2

2026/09/24 02:37

Writeup for nested eval

baumroll1234

nested eval

2026/09/21 23:48

Writeup for nested eval

lumma

nested eval

2026/09/21 23:42

Writeup for flag obfuscation

enesbasmaci

flag obfuscation

2026/09/21 18:32

Writeup for RFC100008

enesbasmaci

RFC100008

2026/09/21 18:31

Writeup for private method

enesbasmaci

private method

2026/09/21 18:31

Writeup for Animal Viewer

enesbasmaci

Animal Viewer

2026/09/21 18:31

Writeup for secret-table-2

enesbasmaci

secret-table-2

2026/09/21 18:30

Writeup for Vending Machine

enesbasmaci

Vending Machine

2026/09/21 18:29

Rows:

Xmas Login

Topic: SQLReleased: Dec 25, 2025

503 solves

Web

Easy🌱2.0

hiikunz