$ 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

Filter and sort these in the challenge browser →

Challenge CTF Weight Has
universal
#java-reverse
 LA 2023 – files wu 1
Pave_The_Way
#java-jar-reversing#decompilation
 COMPFEST 2021 – files wu 1
Flagtureiser
#java-decompilation
 BCACTF 2024 – files wu 1
the_secret_of_java_island
#java-decompilation
 LA 2024 – files wu 1
m0lang
#interpreter-overflow
 m0leCon 2021 Quals 24.55 files wu 1
vault-door-7
#int-to-bytes#bit-shifting
 picoCTF 2019 – files wu 1
msfrob
#import-obfuscation#aes-decryption
 corCTF 2022 24.92 files src wu 1
UnholyEXE
#holyc#zealos-reversing
 WolvCTF 2024 35.25 files wu 1
LockDown
#hardware-reversing#verilog#z3
 WolvCTF 2025 47.25 files wu 1
cliBrowser
#golang-reverse-engineering
 0x41414141 2021 – files wu 1
Escape_the_battlefield
#godot#reversing
 THCon 2024 – files wu 1
portable_graphics
#go-binary-reversing#png-chunk-crafting#custom-chunk
 CTF@AC 2025 Quals 24.53 files wu 1
not_quite_optimal
#gmp#tetration#power-tower
 RITSEC 2026 – files wu 1
slots
#glibc-rand-prediction
 KITCTFCTF 2022 – files wu 1
Esoteric
#ghidra-static-analysis
 OFPPT 2022 – files wu 1
FunctionalCPP
#gdb-scripting#brute-force
 vsCTF 2022 23.32 files wu 1
tertiary
#gdb#dynamic-analysis#ternary
 S4CTF 2021 24.52 files wu 1
MechanicalEngineering
#gcode#binary-encoding
 VishwaCTF 2023 22.69 files wu 1
find-the-chicken
#gameboy
 hxp 2020 94.00 files wu 1
impossible-maze
#game-reversing#maze-solving
 corCTF 2023 36.97 files wu 1
Ghost
#game-reversing
 Hack.lu 2023 94.73 files wu 1
Virtual_RAM
#game-boy-rom-reversing
 1337UP 2023 24.23 files wu 1
Forky
#fork#integer-overflow
 picoCTF 2019 – files wu 1
Unlimited_Power
#file-format-analysis#garmin-fit#fit2csv
 DCTF 2021 – files wu 1
Apollo11
#file-carving#iso-extraction
 VishwaCTF 2021 – files wu 1
Rolling_On_My_Own
#fibonacci-cipher
 idekCTF 2021 24.56 files wu 1
RISC_V.
#feistel-key-inversion
 KubSTU 2026 24.83 files wu 1
Chicken
#esoteric-language#chicken-lang
 BYUCTF 2022 – files src wu 1
Roolang
#esolang-reversing
 ImaginaryCTF 2021 – files wu 1
Embryobot
#elf-patching#shellcode
 BraekerCTF 2024 24.72 files wu 1
sELF_control
#elf-manipulation
 HeroCTF 2021 35.17 files wu 1
Perfect_Blu
#dvd-vm#reversing
 SECCON 2023 Quals 100.00 files wu 1
whatThe
#dtmf-decoding#fft#audio-analysis
 DeconstruCT.F 2023 11.23 files wu 1
guesser
#dotnet-reversing#z3
 Tamil 2021 14.13 files wu 1
Hollywood
#dotnet-reversing#dnspy#string-decryption#anti-debug-bypass
 CYBERGON 2023 – files wu 1
Pizza
#dotnet-reversing
 Junior.Crypt 2024 23.13 files wu 1
SamuraiInfection
#dna-encoding#nucleotide
 RITSEC 2021 – files wu 1
Give_My_Money_Back
#deobfuscation
 HeroCTF 2023 – files wu 1
Crackme
#custom-vm-reversing#bytecode-interpreter
 3kCTF 2021 24.14 files wu 1
Rasm
#custom-vm-reversing
 K3RN3LCTF 2021 24.37 files wu 1