Math Playground – Great games and logic puzzles
Math and the Movies – Movie and televison clips having to do with mathematics
Online Puzzle Games – Includes puzzle bridges, sudokus, nonograms, and others
Simon Tatham’s Portable Puzzle Collection – Contains a large amount of logic puzzles
The Problem Site – Brainteasers, strategy games, puzzles, and more
Optical Illusions and Visual Phenomena
Who Wants to Be a Mathionaire – From the Math is Fun website
Mathschallenge – Some good math challenges
The Problem Site – Math games, word games, strategy games, puzzles and more
Puzzles.com – Great source for logic puzzles, visual puzzles, word puzzles, interactive puzzles, illusions, and so much more
Puzzlers Paradise – Good source of logic puzzles
Conceptis Puzzles – Another puzzle source
Math Play – Games in many areas of the curriculum
A+Click Math and Logic Problems
The Locker Puzzle (a great solution by James Tanton)
Mathwire – listed as enrichment topics, but contains a variety of games in all areas, also see their games page
Brain Games and Riddles – good collection of brain games, brain teasers, and riddles
