AlpacaHack Logo
Sign InSign Up

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

0

/31

No solved challenges yet.

Sign In to view your player stats

Today's Challenge
kanonkanon
honk the klaxon
Crypto
Medium
28 solves
Submissions (latest 3)
itsuki-t

SOLVED!

Jun 24, 1:31 AM

Leaderboard

Try the first challenge

Is this your first CTF? Let's begin by tackling the first challenge released on Daily AlpacaHack.

View challenge
admin
AlpacaHack 2100
Misc
Welcome🌱
1,908 solves
Upcoming challenges reveal the , , and in advance.
Prev

Mar 2026

Next
Solved
Unsolved
Upcoming
Mon
Tue
Wed
Thu
Fri
Sat
Sun
23
kakur41kakur41
Alpaca Quest
Rev
Medium
125 solves
24
minaminaominaminao
hit-and-hit
Misc
Hard
89 solves
25
tchentchen
Alpaca Rangers
Web
Medium
168 solves
26
kurenaifkurenaif
27
tchentchen
28
minaminaominaminao
pyjs
Misc
Hard
87 solves
1
admin
Alpaca meets QR
Misc
Welcome🌱
351 solves
2
kakur41kakur41
Bars
Web
Easy🌱
366 solves
3
tan90909090tan90909090
glibc's secret function
Rev
Easy🌱
215 solves
4
minaminaominaminao
Flag Printer 2026
Misc
Easy🌱
228 solves
5
tchentchen
Alert my Flag
Web
Medium
190 solves
6
moramora
magic number
Misc
Medium
132 solves
7
theoremoontheoremoon
high and low
Crypto
Hard
91 solves
8
arkark
guess.js
Misc
Hard
109 solves
9
minaminaominaminao
FLAG OVER
Misc
Medium
120 solves
10
arkark
💯
Misc
Medium
126 solves
11
pppp4649pppp4649
Find XOR key
Crypto
Easy🌱
168 solves
12
colza
kappa overflow
Pwn
Medium
133 solves
13
tchentchen
Another Login Challenge
Web
Medium
144 solves
14
asusnasusn
Heuristic IPPON
Misc
Easy🌱
182 solves
15
minaminaominaminao
flag.txt
Misc
Hard
117 solves
16
pppp4649pppp4649
The future path
Crypto
Medium
94 solves
17
tchentchen
Free Coupon
Web
Medium
150 solves
18
arkark
PPPPParse
Misc
Medium
101 solves
19
rsk0315
Flags for the FLAG
Misc
Easy🌱
161 solves
20
colza
canary leak
Pwn
Medium
117 solves
21
chocoruskchocorusk
Alpacker
Rev
Hard
83 solves
22
k0080k0080
vuln4vuln
Pwn
Hard
104 solves
23
kanonkanon
bloom
Crypto
Medium
91 solves
24
tchentchen
What's Next
Web
Medium
118 solves
25
kurenaifkurenaif
crypto_666
Crypto
Medium
111 solves
26
tan90909090tan90909090
Optimized expression
Rev
Easy🌱
127 solves
27
minaminaominaminao
encrypted-p
Crypto
Medium
109 solves
28
hiikunzhiikunz
EncodeDecode
Misc
Hard
89 solves
29
tchentchen
Dot Chain
Misc
Hard
88 solves
30
tchentchen
Tar Uploader
Web
Medium
107 solves
31
blackade
silence
Misc
Medium
101 solves
1
admin
OSINT
Misc
Welcome🌱
424 solves
2
tchentchen
Message For You
Web
Easy🌱
293 solves
3
pppp4649pppp4649
You are my friend
Crypto
Easy🌱
218 solves
4
hiikunzhiikunz
Impossible Puzzle
Web
Easy🌱
253 solves
5
kanonkanon
The Horn
Crypto
Medium
111 solves

Want a harder challenge?

Go to B-SIDE

Writeups

Daily AlpacaHackに挑戦するつくよみちゃん 06/23/Secret Renderer/tchen

tsukuyomi-chan

ja
Secret Renderer

9 hours ago

minaminao

Writeup for ✌️✌️✌️

author
ja

2026/06/22 17:14

Daily AlpacaHackに挑戦するつくよみちゃん 06/22/✌️✌️✌️/minaminao

tadanobutubutu

Writeup for ✌️✌️✌️

tadanobutubutu

Writeup for what-is-my-size

Daily AlpacaHackに挑戦するつくよみちゃん 06/20/xorshift521/nozokare

ja

2026/06/20 15:40

Rows: