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View the Skytopian gallery, hear intricate music at the SoundBurst Shrine, relive hidden treasures in classic gaming, learn amusing trivia about science and see ...

Shows Solar System true to scale. Helps realize the vastness of distances between planets compared to planet sizes.

The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.

Welcome to techInterview, a site for technical interview questions, brain teasers, puzzles, quizzles (whatever the heck those are) and other things that make you ...

Optical illusions, 3D stereograms and anaglyphs, fractals and brain teasers

A selection of common images.

Free Printable Sudoku puzzles. Six difficulty levels. Image or PDF, 6 sudokus per page

A collection of riddles and optical illusions of many different forms with thumbnail browsing.