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. The challenges are all set up with the intent of being hacked, making it an excellent, legal way to get hands-on experience.
I also tried challenging. There were also quite a difficult problem, it was about a little over 1000 points. I think I will do my best to study security technology a little more.