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 * [CheckIO](http://www.checkio.org/)
 * [CodeHunt](https://www.codehunt.com/)
 * [Coding Bat](http://codingbat.com/java)
+* [Exercism](http://exercism.io/)
 * [Google Code Jam - Practise](https://code.google.com/codejam/contests.html)
 * [Hacker.org](http://www.hacker.org/)
 * [Mathproblem of the Month - Bilkent University](http://www.fen.bilkent.edu.tr/~cvmath/prob-month.html)