Misc challenges
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
5,979 in the index. The 200 below are ranked by how many independent published solutions exist - which is the right order for learning, not for difficulty. A challenge with nine writeups gives you nine explanations of the same technique to compare; a harder one nobody documented gives you none.
SC1: Math bot
AlexCTF 201715 writeupsShifter
ångstromCTF 2020 202013 writeupsSticky Fingers
GreHack CTF 2019 201913 writeupsBad Apple
DCTF 2021 202112 writeupsformatting
DownUnderCTF 2020 202012 writeupsslithery
CSAW CTF Qualification Round 2020 202012 writeupsObat Penggugur Kandungan Yang Aman Wa : 0822 4236 1182
noxCTF 2018 201812 writeupsCode 60 - It's Prime Time!
Internetwache CTF 2016 201612 writeupsMisc 50 - The Hidden Message
Internetwache CTF 2016 201612 writeupsTutorial
CSAW CTF Qualification Round 2016 201612 writeupsAddition
DownUnderCTF 2020 202011 writeupsKill
CSAW CTF Qualification Round 2016 201611 writeupsWarmup
CSAW CTF Qualification Round 2016 201611 writeupsuglybash
redpwnCTF 2020 202010 writeupsEnter Space-Time Coordinates
Google Capture The Flag 2019 (Quals) 201910 writeupsI heard you like files.
TAMUctf 19 201910 writeupsSQL
TAMUctf 19 201910 writeupsWork Computer
Google Capture The Flag 2019 (Quals) 201910 writeupsCode 50 - A numbers game
Internetwache CTF 2016 201610 writeupsmfw
CSAW CTF Qualification Round 2016 201610 writeupsMisc 70 - Rock With The Wired Shark
Internetwache CTF 2016 201610 writeupsTrivia 50
CSAW CTF Qualification Round 2013 201310 writeupsRevision
RITSEC CTF 2021 20219 writeupsThe Count
DEADFACE CTF 20219 writeupsFake File
NahamCon CTF 20209 writeupsOn the spectrum
DownUnderCTF 2020 20209 writeupsrot-i
DownUnderCTF 2020 20209 writeupsZipped Up
TJCTF 2020 20209 writeupsHello World
TAMUctf 19 20199 writeupsELF Crumble
DEF CON CTF Qualifier 2018 20189 writeupsClams Don't Dance
CSAW CTF Qualification Round 2016 20169 writeupsMisc 60 - Quick Run
Internetwache CTF 2016 20169 writeupsMisc 50
CSAW CTF Qualification Round 2013 20139 writeupsTreebox
Google Capture The Flag 2022 20228 writeupsAuthenticator
Cyber Apocalypse 2021 20218 writeupsFilestore
Google Capture The Flag 2021 20218 writeupsPing Pong
HeroCTF v3 20218 writeupsRussian Doll
HeroCTF v3 20218 writeupsStrong password
DCTF 2021 20218 writeupsSystem dROP
Cyber Apocalypse 2021 20218 writeupsTsunami
H@cktivityCon 2021 CTF 20218 writeupsAlkatraz
NahamCon CTF 20208 writeupsCracker Barrel
AUCTF 2020 20208 writeupsIn a pickle
DownUnderCTF 2020 20208 writeupsLorem Ipsum
CyberYoddha CTF 2020 20208 writeupsSecret Array
FwordCTF 2020 20208 writeupsws2
ångstromCTF 2020 20208 writeupsZip-a-Dee-Doo-Dah
Houseplant CTF 2020 20208 writeupsHome Computer
Google Capture The Flag 2019 (Quals) 20198 writeupssuckmore-shell
WPICTF 2019 20198 writeupsWordpress
TAMUctf 19 20198 writeupsC1: dot-n-dash
Square CTF 2018 20188 writeupsEnum
TAMUctf 18 20188 writeupsvimshell
TokyoWesterns CTF 4th 2018 20188 writeupszumbo 1 & 2 & 3
BSides San Francisco CTF 20178 writeupsAll your Base are belong to us
IceCTF 2016 20168 writeupsGametime
CSAW CTF Qualification Round 2016 20168 writeupsThor's a hacker now
IceCTF 2016 20168 writeupsGuessTheNumber
Hack.lu CTF 2015 20158 writeups3dub 1
DEF CON CTF Qualifier 2013 20138 writeups3dub 2
DEF CON CTF Qualifier 2013 20138 writeupsabroad study notes
Nullcon Goa HackIM 2025 CTF 20257 writeupsBaby's First IoT Flag 1
UofTCTF 2024 20247 writeupsSecret Message 1
UofTCTF 2024 20247 writeups2ez
H@cktivityCon 2021 CTF 20217 writeupsA Bowl of Pythons
San Diego CTF 2021 20217 writeupsArchaic
ångstromCTF 2021 20217 writeupsBad Developers
RTLxHA CTF 21 20217 writeupsButterOverflow
H@cktivityCon 2021 CTF 20217 writeupsDon't let it run
DCTF 2021 20217 writeupsDragon
DCTF 2021 20217 writeupsencoder
S.H.E.L.L. CTF 20217 writeupsEncrypted the flag I have
DCTF 2021 20217 writeupsJulius’ ancient script
DCTF 2021 20217 writeupsLog 4 sanity check
hxp CTF 2021 20217 writeupsTimed
TJCTF 2020 20207 writeupsadded protection
DownUnderCTF 2020 20207 writeupsdora
nullcon HackIM 2020 20207 writeupsfile-system-based strcmp go brrrr
PlaidCTF 2020 20207 writeupsgolf.so
PlaidCTF 2020 20207 writeupsGranular Data
b01lers CTF bootcamp 20207 writeupsinspector-general
redpwnCTF 2020 20207 writeupsLeggos
DownUnderCTF 2020 20207 writeupsstatic-static-hosting
redpwnCTF 2020 20207 writeupsVortex
NahamCon CTF 20207 writeupsws1
ångstromCTF 2020 20207 writeupsbabycryptoweb
FireShell CTF 2019 20197 writeupsOnboarding Checklist
TAMUctf 19 20197 writeupsOnion Layer Encoding
RITSEC CTF 2019 20197 writeupsSecure Coding-PWN
TAMUctf 19 20197 writeupsWelcome
Securinets CTF Quals 2019 20197 writeupsWhere am I?
TAMUctf 19 20197 writeupsShort_circuit
CSAW CTF Qualification Round 2018 20187 writeupsSerial
CSAW CTF Qualification Round 2017 20177 writeupszipper
PlaidCTF 2017 20177 writeupsAsian Cheetah
Sharif University CTF 2016 20167 writeupsCertified Excel Hacker
EKOPARTY CTF 2016 20167 writeupsComplacent
IceCTF 2016 20167 writeupsScavenger Hunt
IceCTF 2016 20167 writeupsSearch
IceCTF 2016 20167 writeupsProgramming 100
Trend Micro CTF Asia Pacific & Japan 2015 Online Qualifier 20157 writeupsProgramming 200
Trend Micro CTF Asia Pacific & Japan 2015 Online Qualifier 20157 writeups3dub 4
DEF CON CTF Qualifier 2013 20137 writeupsMisc 200
PHD CTF Quals 2012 20127 writeupsProfound thought
Nullcon Goa HackIM 2025 CTF 20256 writeupsUSBNet
Nullcon Goa HackIM 2025 CTF 20256 writeupsEnableMe
UofTCTF 2024 20246 writeupsKitty
KnightCTF 2024 20246 writeupsVoice Changer
UofTCTF 2024 20246 writeupswrite-flag-where2
Google Capture The Flag 2023 20236 writeupsCompressor
Cyber Apocalypse CTF 2022: Intergalactic Chase 20226 writeupsanonym
S.H.E.L.L. CTF 20216 writeupsBlob
RITSEC CTF 2021 20216 writeupsHidden message
DCTF 2021 20216 writeupsIdentifications
DawgCTF 2021 20216 writeupsLeak Spin
DCTF 2021 20216 writeupsLost in Transmission
San Diego CTF 2021 20216 writeupsMeet The Team
NahamCon CTF 2021 20216 writeupsmessage-board
HSCTF 8 20216 writeupsNRC
HSCTF 8 20216 writeupsOTP Smasher
H@cktivityCon 2021 CTF 20216 writeupsrabbit
DownUnderCTF 2021 (Online) 20216 writeupsSix Four Over Two
H@cktivityCon 2021 CTF 20216 writeupsThird Eye
DawgCTF 2021 20216 writeupsTrick or Treat
DEADFACE CTF 20216 writeupsTwo Truths and a Fib
DawgCTF 2021 20216 writeupsVeebee
NahamCon CTF 2021 20216 writeups[insert creative algo chall name]
rgbCTF 2020 20206 writeupsArithmetics
castorsCTF20 20206 writeupsbasics
Google Capture The Flag 2020 20206 writeupsCaaSINO
redpwnCTF 2020 20206 writeupsDon't Break Me!
AUCTF 2020 20206 writeupsEchoes of Reality
b01lers CTF bootcamp 20206 writeupsFind Me
DarkCTF 20206 writeupsNeedle In a Haystack
b01lers CTF bootcamp 20206 writeupsOreo
csictf 2020 20206 writeupsPI 1: Magic in the Air
rgbCTF 2020 20206 writeupsPyjail ATricks
ALLES! CTF 2020 20206 writeupsReally Powerful Gnomes
NahamCon CTF 20206 writeupsRecurzip
RaziCTF 2020 20206 writeupsSatan's Jigsaw
Houseplant CTF 2020 20206 writeupsSora
AUCTF 2020 20206 writeupsSuckmore Shell
WPICTF 2020 20206 writeupsSupa Secure
CyberYoddha CTF 2020 20206 writeupsTim Tams
DownUnderCTF 2020 20206 writeupsToo Many Credits 2
TAMUctf 2020 20206 writeupsTreeeeeeee
riceteacatpanda 20206 writeupswriteonly
Google Capture The Flag 2020 20206 writeupsZima Blue
b01lers CTF bootcamp 20206 writeupsalgo_auth
Codegate CTF 2019 Preliminary 20196 writeupsBroken GPS
HSCTF 6 20196 writeupsDrive to the target
Google Capture The Flag 2019 (Quals) 20196 writeupsLogin App 2
TAMUctf 19 20196 writeupsnyanyanyan
STEM CTF: Cyber Challenge 2019 20196 writeupsTimeWarp
SunshineCTF 2019 20196 writeupsWho am I?
TAMUctf 19 20196 writeupsWho do i Trust?
TAMUctf 19 20196 writeupsAnticaptcha
IceCTF 2018 20186 writeupsBeginner's Quest - Moar
Google Capture The Flag 2018 (Quals) 20186 writeupsC2: flipping-bits
Square CTF 2018 20186 writeupsEV3 Basic
HITCON CTF 2018 20186 writeupsNumber Game
RCTF 2018 20186 writeupsJunior - Zipfile One
SHA2017 CTF 20176 writeupsMindreader
Google Capture The Flag 2017 (Quals) 20176 writeupspplc
Tokyo Westerns CTF 3rd 2017 20176 writeupsQr code madness
Security Fest 2017 20176 writeupsRun me!
SECCON 2017 Online CTF 20176 writeupsTR4: Doesn't our logo look cool ?
AlexCTF 20176 writeups1magePr1son- Nozambique
H4ckIT CTF 2016 Online 20166 writeupsCoinslot
CSAW CTF Qualification Round 2016 20166 writeupsDamaged
EKOPARTY CTF 2016 20166 writeupsGoodtime
RC3 CTF 2016 20166 writeupsIRC I
IceCTF 2016 20166 writeupsProgramming 1
HackIM 2016 20166 writeupsSanta walks into a bar
The 318br, DESEC, and SucuriHC Capture The Flag (3DSCTF) 20166 writeupsSleeping Guard
CSAW CTF Qualification Round 2016 20166 writeupswtf.sh (1)
CSAW CTF Qualification Round 2016 20166 writeupscatwestern
DEF CON CTF Qualifier 2015 20156 writeupsHard Interview
PoliCTF 2015 20156 writeupshard to say
HITCON CTF 2015 Quals 20156 writeups3dub 3
DEF CON CTF Qualifier 2013 20136 writeupsbigfile of secret
SECUINSIDE CTF Quals 2013 20136 writeupsropasaurusrex
PlaidCTF 2013 20136 writeupsSeen
Nullcon Goa HackIM 2026 CTF 20265 writeupsFlying High
UofTCTF 2024 20245 writeupsLevi Ackerman
KnightCTF 2024 20245 writeupsMade Sense
WolvCTF 2024 20245 writeupsNo Code
UofTCTF 2024 20245 writeupsOut of the Bucket
UofTCTF 2024 20245 writeupsDino Trading
WolvCTF 2023 20235 writeupsRestricted
Cyber Apocalypse 2023: The Cursed Mission 20235 writeupsZombie 101
WolvCTF 2023 20235 writeupsPimpMyVariant
Insomni'hack teaser 2022 20225 writeupsWeather
Google Capture The Flag 2022 20225 writeupsAgent Gerald
BCACTF 2.0 20215 writeupsBad Words
H@cktivityCon 2021 CTF 20215 writeupscheck_flag
S.H.E.L.L. CTF 20215 writeupsCollide
S.H.E.L.L. CTF 20215 writeupsDeserted Island Toolkit
DawgCTF 2021 20215 writeupsdevprivops
FwordCTF 2021 20215 writeups
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