Puzzles for Software Engineer IT Puzzles for Software Engineer and Developer level: 1 http://challenge-your-limits.herokuapp.com/ » level: 2 http://challenge-your-limits2.herokuapp.com/ » level: 3 http://challenge-your-limits3.herokuapp.com/ » level: 3 http://challenge-your-limits4.herokuapp.com/ » level: 1 http://challenge-your-limits5.herokuapp.com/ » level: 5 http://challenge-your-limits6.herok