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 |[PicoCTF](https://picoctf.com/)|picoCTF is a computer security game targeted at middle and high school students. The game consists of a series of challenges centered around a unique storyline where participants must reverse engineer, break, hack, decrypt, or do whatever it takes to solve the challenge.|
 |[Puzzlemall](https://code.google.com/archive/p/puzzlemall/)|PuzzleMall - A vulnerable web application for practicing session puzzling|
 |[Pwnable.kr](http://pwnable.kr/)|'pwnable.kr' is a non-commercial wargame site which provides various pwn challenges regarding system exploitation. while playing pwnable.kr, you could learn/improve system hacking skills but that shouldn't be your only purpose.|
-|[Pwnerrank](httpswww.pwnerrank.com/)|Website with different kinds of hacking exercises of varying difficulty, including web, reversing and binary exploitation. You are awarded points for each successful challenge solved, forming a ranking amongst the users.|
 |[Pwnos](http://www.pwnos.com/)|PwnOS is a vulnerable by design OS .. and there are many ways you can hack it.|
 |[Ringzero](https://ringzer0team.com/challenges)|Challenges you can solve and gain points.|
 |[Root Me](https://www.root-me.org/)|Hundreds of challenges and virtual environments. Each challenge can be associated with a multitude of solutions so you can learn.|