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I know two websites that offer some challening puzzles for programming, Project Euler (PE has something about math, but I feel it's more about programming) and Code-Golf.

Can you recommend me some sites that have the same purpose for maths? Until now I know only The Art of Problem Solving. You can recommend me these websites in any level.

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    Project Euler has a good bunch of problem that are possible to do with only paper and pencil. The Project Euler forum has a thread about it : http://forum.projecteuler.net/viewtopic.php?f=50&t=1982 those problem are probably more what you are looking for if you want math only problem.2012-09-17
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    You can add [Brilliant.org](http://brilliant.org) to the list.2014-04-15

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