W3 Challenges W3Challs is a penetration testing training platform, which offers various computer challenges, in categories related to security: Hacking, Cracking, Wargame, Forensic, Cryptography and Programming.They have a suggested order to play the games in in their “About”. To find out more about a certain wargame, just visit its page linked from the menu on the left. The wargames offered by the OverTheWire community can help you to learn and practice security concepts in the form of fun-filled games.

Over The Wire Again one of all-time favorites.

For example, each competition participating teams, the winning team, their members, their write-ups, etc… They classify the challenges by year and profide useful information and statistics.

CTFTIME One of the biggest Capture The Flag (CTF) archives.

24/7 CTF Join now to continuously test your skills across web, crypto, networking, reversing and exploitation vulnerabilities and challenges.

They provide a scoring system, the harder the challenge is, the more score you win.

The only thing you must do is click “play” on the upper left zone, choose a game and Pwn it. While playing pwnable.kr, you could learn/improve system hacking skills but that shouldn’t be your only purpose. pwnable.kr is a non-commercial wargame site which provides various pwn challenges regarding system exploitation.

Pwnable Pwnable is a classic, one of all-time favorites.

The list is ordered in no particular way. Creating such challenges requires and involves a lot of time, knowledge and creativity. Please note that this is a mere compilation, all credits go to their respective authors. The sites listed below will help you understand and practice every aspect of the secure (or rather insecure) side of software, networks (networking), servers and every single element that may be exposed in the(our) binary world. Have you ever wondered where to start hacking, acquire more hacking knowledge and even train, test and improve your hacking skills? Here is a compilation, collection, list, directory of the best sites that will help you.

Free hacking sites