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47 Sites
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47 Active Sites
World of Wargame
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TryThis0ne
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Hacker.org
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Webhacking.kr
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OverTheWire.org
RedTigers Hackit
Defend the Web
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ae27ff
pwnable.kr
RingZer0 Team Online CTF
pwnable.tw
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PromptRiddle
PWN.TN
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High ranked:  Hacking-Challenges
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