- http://sixrevisions.com/resources/10-puzzle-websites-to-sharpen-your-programming-skills/
- http://www.coderholic.com/10-more-puzzle-websites-to-sharpen-your-programming-skills/
- http://comeoncodeon.wordpress.com/page/2/
- http://tausiq.wordpress.com/
- http://www.iarcs.org.in/inoi/contests/allproblems.php
- http://www.careercup.com/
- https://www.interviewstreet.com/challenges/
- https://www.facebook.com/ProgrammingInterviews
- http://blog.seattleinterviewcoach.com/2009/02/140-google-interview-questions.html
- http://www.cse.iitd.ernet.in/~sbaswana/Puzzles/Algo/algo.html
- http://www.comp.nus.edu.sg/~stevenha/programming/vol1.html
- http://www1.cs.columbia.edu/~kns10/interview/
- http://concentratedlemonjuice.blogspot.com/2008/05/puzzles_4358.html
