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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No solved challenges yet.

Today's Challenge

Submissions (latest 3)

chara0x

SOLVED!

Sep 24, 11:24 PM

hiroyuki

SOLVED!

Sep 24, 11:08 PM

prof

SOLVED!

Sep 24, 10:35 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.

Sep 2026

Solved

Unsolved

Upcoming

Mon

Tue

Wed

Thu

Fri

Sat

Sun

tchen

Springing

Web

Medium

74 solves

admin

QUIZ ALPACASHOCK

Misc

Welcome🌱

132 solves

hiikunz

base 16-32-64

Misc

Easy🌱

107 solves

3-4

tan90909090

Let's Shut Down Linux

Misc

Medium

63 solves

baumroll1234

Vending Machine: Revised Version

Misc

Easy🌱

88 solves

6-8

minaminao

Bitflip RSA

Crypto

Hard

56 solves

minaminao

Bitflip RSA

Crypto

Hard

56 solves

9-11

minaminao

＼^o^／

Misc

Hard

43 solves

12-13

tan90909090

sin function vs. fsin instruction

Rev

Misc

Medium

55 solves

14-15

tan90909090

integer division

Misc

Medium

71 solves

16-18

edwowmath

neighboRhood_diStAnce

Crypto

Hard

42 solves

19-21

hiikunz

nested eval

Misc

Hard

48 solves

hiikunz

nested eval

Misc

Hard

48 solves

22-24

2501

The 3rd

Crypto

Hard

36 solves

25-26

haihuiliyuyuan

typhoon-pythoon

Rev

Medium

16 solves

Coming soon

Want a harder challenge?

Go to B-SIDE

Writeups

Writeup for The 3rd

baumroll1234

The 3rd

3 hours ago

Small Image Uploader 2 Writeup

sota70

Small Image Uploader 2

21 hours ago

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:

Floating Equality

Topic: Floating-PointReleased: Jun 12, 2026

97 solves

Misc

Medium4.5

rsk0315

Tags

USER	SOLVED AT
bigmc1971	2026/08/24 08:50
mamonbo	2026/08/20 16:49
shanoit-sano	2026/07/01 10:00
nakamulab	2026/06/29 15:44
goat-antony2008	2026/06/29 08:59
kuroiko	2026/06/27 13:22
tsukuyomi-chan	2026/06/27 06:47
guren	2026/06/25 04:12
unubore	2026/06/14 15:01
redpo	2026/06/14 14:00
rrrsk	2026/06/14 00:15
serioton	2026/06/14 00:11
kakur41	2026/06/13 12:30
ctf-udon	2026/06/13 08:18
mao	2026/06/13 02:21
dkong	2026/06/13 01:47
lumma	2026/06/13 01:11
despair09	2026/06/12 16:23
tyage	2026/06/12 14:26
tenagazaru	2026/06/12 14:03
kumabear	2026/06/12 13:51
n0name	2026/06/12 13:23
embe221ed	2026/06/12 12:54
unity	2026/06/12 12:41
kyoro	2026/06/12 12:39

Rows:

description solves writeups