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One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.
it is like a game and i can till i learned a lot of code and code tuning out of that
i am not sure if i can post some samples here but most of hacking games online include such challenges
option 2: try to solve some of the questions here even if u didn't get the credit but you will still have learned something
personally i did both
Good Luck