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Browse all Recommended Challenge Sets
Choose a discipline to explore a focused set of challenges.
01 WEB21 challenges
Web Security
Explore application logic, input handling, sessions, and trust boundaries.
Open set 02 CRYPTO8 challengesCryptography
Work through ciphers, protocol assumptions, and hidden structure.
Open set 03 STEGANO9 challengesSteganography
Find what is concealed in files, formats, and signals.
Open set 04 REVERSING8 challengesReverse Engineering
Trace program behavior and reconstruct how it works.
Open set 05 MISC9 challengesMiscellaneous
Investigate unusual formats, systems, and cross-discipline puzzles.
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FEATURED COLLECTION
Rayaseiren's Challenge CollectionCurated by CodeShell.kr Co-Founder | 55 challenges
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Recommended Challenge Set
Explore a Wargame collection created by the Co-Founder of CodeShell.

