Problem Solving
The Puzzling World of Barry R. Clarke
An award winning problem solving site with a lot of brain teasers.
Mathematics Problem Solving Task Centres
A problem solving task site from the Mathematical Association of Victoria.
EMAT 4600/6600 Problem Solving in Mathematics
This is the web site page devoted to EMAT 4600/6600 Problem Solving in Mathematics, at the University of Georgia, as led by Jim Wilson. Those problems inside may require some basic mathematics knowledge. Recommended from higher form students.