$ ctf42

Reverse CTF challenges

4,044 Reverse CTF challenges from 397 CTFs (2011–2026), 511 with writeups.

Top reverse techniques

#reversing 77 #xor 24 #z3 15 #vm-reversing 13 #constraint-solving 10 #static-analysis 9 #strings 9 #android 9 #anti-debugging 7 #symbolic-execution 6 #dotnet-reversing 6 #xor-cipher 5 #angr 5 #windows-reversing 5 #binary-patching 5

Challenges

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Challenge CTF Weight Has
div3rev TJCTF 2023 – files wu 1
super_qomputer DiceCTF 2023 36.70 files wu 1
BetGame VishwaCTF 2022 20.79 files wu 1
KeyGenMe TyphoonCon 2022 21.50 files wu 1
Resolver HeroCTF 2022 51.22 files wu 1
atcs-nightmare HSCTF 2022 – files wu 1
block-game TJCTF 2022 – files wu 1
covfefe TAMUctf 2022 – files wu 1
crackme-pls TetCTF 2022 36.72 files wu 1
flag_checker KnightCTF 2022 17.38 files wu 1
fun-reversing-challenge Paradigm 2022 25.00 files wu 1
hidden TetCTF 2022 36.72 files wu 1
labyrinth TAMUctf 2022 – files wu 1
magicbox TetCTF 2022 36.72 files wu 1
obsessive-checking TAMUctf 2022 – files wu 1
redo1 TAMUctf 2022 – files wu 1
Crack_House TMUCTF 2021 – files wu 1
Cryptex DaVinciCTF 2021 24.50 files wu 1
Evil_Eye UUTCTF 2021 – files wu 1
Flag_Printer TMUCTF 2021 – files wu 1
MargaREt Shakti 2021 25.00 files wu 1
Monstrosity ALLES 2021 – files wu 1
Prime_Extravaganza UIUCTF 2021 – files wu 1
Trailblazer BCACTF 2021 – files wu 1
Useless_VM SunshineCTF 2021 23.34 files wu 1
Voice_of_UUTCTF UUTCTF 2021 – files wu 1
connect_the_dots DownUnderCTF 2021 – files wu 1
filling-blanks ImaginaryCTF 2021 – files wu 1
hxp3drm hxp 2021 99.41 files wu 1
solver TrollCAT 2021 21.87 files wu 1
warmwelcome S4CTF 2021 24.52 files wu 1
0racle KalmarCTF 2026 49.97 files
2bird2can DEFCON 2026 Quals 63.22 files
3d_maze GreyCatTheFlag 2026 Quals – files
404 THJCC 2026 Summer – files
67 MidnightFlag 2026 24.50 files
ASIS_Arch ASIS 2026 Quals 90.53 files
A_Golden_Experience ApoorvCTF 2026 24.10 files
A_Golden_Experience_Requiem ApoorvCTF 2026 24.10 files
A_LICENSE_ON_THE_PSX MntcrlCTF 2026 25.00 files