Hacking games / Internet Puzzles

Playing is fun, and if you can learn something new, much better !  It is a good way to know people with similar interests also.
Here are two platforms to resolve complex problems that also guide you in the world of internet puzzles.
Rootme: Even its design may not be so heavy, eye catching, or call it how you want, i like it very much because it has many categories of problems.
HackTheBox: is another one, a coworker talked me about this one, to enter you have to resolve a problem that depending on your experience and knowledge could be hard or medium... or easy ?

What other puzzle games do you know similar to these ones ?

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