AlphaCode
Reverse-engineering a custom esolang stack machine to recover the flag.
Reversing
Reverse engineering challenges from boroCTF 2026.
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Amazing
Reversing a Python marshal bytecode maze generator seeded by an LCG to find the escape path.
cat
Reversing a repeating-key XOR crackme that downloads the flag from catbox.moe.
Franklin
Recovering the flag from TrueType GSUB ligature substitution rules.
George Orwell
Decompiling a compiled AutoHotkey executable to extract the flag.
Hidden But Definitely Not
Recovering a flag hidden via stack-string construction and XOR obfuscation.
Not Your Time
Crackme that stores the bitwise NOT of the flag bytes; invert them to get the flag.
Perfectly Destructive File
Extracting a flag hidden inside a PDF stream using FlateDecode and base64.