If you like brain challenges, then you'll love all of the Perplexus maze games by PlaSmart. These round spheres will keep kids and adults entertained for hours maneuvering the ball along the various tracks and obstacles. 4 different versions are available that include Perplexus Epic, Perplexus, Perplexus Twist and Perplexus Rookie.
Here's a link to a full review of each Perplexus game.
Perplexus Mazes are the toys to have this Christmas.