problem solving websites needed

[Vals509]

Hi all
Can anyone give me some websites which are on problem solving. When i mean problem solving, i mean logical sums not you standard maths problems. Also i want it to be a high school difficulty, not a uni type.

Any websites are greatly appreciated

[n!kofeyn]

I'm not really for sure what you mean by logical sums, but maybe check out the Art of Problem Solving forums (http://www.artofproblemsolving.com/Forum/index.php).