Visitors can stay at Hotel Infinity, stage a play at Unusual School, or unravel knotty dilemmas at Untangling the Mathematics of Knots. The problems here take longer to set up, but they're worth it. Greg's Brain Games Students will enjoy the interactive brainteasers and Plexers at this site. Check it out. This site provides several brain-busting games, including Master Web , a game of logic in which the object is to decipher the code represented by a series of colored balls.
Illusions is a terrific site loaded with information about illusions.
Check it out, then go to the Illusion Puzzles and try to solve them. The list of links is as comprehensive as you'll find anywhere, but most of the puzzles are for older students and adults. The Web offers plenty of exercises to help your students keep their brains in shape. Check them out whenever you or your students need a boost. Brother Bear's Brain Teasers includes two brainteasers for young children.