Maths Challenge
Maths challenge.net: Problem Solving Database
Need some challenging problem-solving work for your students in the following areas: Discrete, Geometry, Numbers, and Code Breaking? This is the place for an enormous database of problems aimed at high school age students. They are...
Scholastic
Scholastic: I Spy
These interactive matching games for elementary age students combine visuals of familiar objects and rhyming riddles to create brain-teasing puzzles.