Puzzles

• erichs puzzle palace
• BrainBashers: brain teasers, games and illusions ...
• tricky and clever puzzles, baffling and perplexing illusions etc.
• user submitted and ranked brain teasers and logic problems
• Shadypuzzle.com – a fun logic puzzle
• BrainHelper.org - a website dedicated to the human brain
• Logic-Puzzles.org
• Alpha Sleuth™: tantalizing puzzles for the astute word detective
• focuset - nutritional supplement for memory improvement
• mathematics, number series ...
• pzzls - puzzles, riddles and brain teasers
• monkeying around - dot-to-dot books
• puzzles of Leonid Mochalov
• cyber teaser
• higher mathematics
• archive of mathematical puzzles
• math as a science, illusions ...
• another archive of mathematical puzzles
• another puzzles
• discovery school puzzles
• games, puzzles, chess problems ...
• Bruno's chess problem of the day
• Free online jigsaw puzzles
• Akiyoshi's illusion pages
• optical illusions, hidden images, impossible objects, upside downs and wordplay
• optical illusions, eye tricks ...
• optical illusions, 3D images and other mind-teasing oddities