Problem Solving Websites

http://www.thelogiczone.plus.com  -   A Wide range of Logic Puzzles

http://www.mathsnet.net/trail/index.html

http://mathschallenge.net/

http://www.figurethis.org/challenges/toc.htm

http://tlfe.org.uk/numeracy/#mathschallenge

http://www.cut-the-knot.org/games.shtml

http://www.stfx.ca/special/mathproblems/welcome.html

http://www.mathplayground.com/logicgames.html

http://www.puzzles.com/Projects/PacksAndCollections.htm

http://krazydad.com/sudoku/