Zipception — 3000 Nested ZIPs
A flag is hidden inside 3000 recursively nested ZIP archives. Loop backwards from flag3000.zip to flag1.zip, extracting and deleting each archive in turn until the innermost file is revealed.
Python
Zipception 2.0 — Nested ZIPs with Password Protection
100 nested password-protected ZIPs. Crack each archive’s password against the rockyou wordlist, extract, delete, and repeat — 100 times.