Brain Teasers
- 41
- Solving Paint-by-Numbers Puzzles with Integer Programming
- Article and instructions on solving puzzles.
- 42
- Akiyoshi's illusion pages
- Many works of Akiyoshi Kitaoka. Designs around standard illusions crafted to maximise the illusory effect.
- 43
- Amos Storkey - Visual Illusion of the Month
- Collection of illusions and images chosen for novelty and distinction from the usual set found in most collections.
- 45
- Cool Optical Illusions
- A growing collection of optical illusions and eye tricks, including original illusion pictures and a collection of optical illusion desktop wallpaper.
- 46
- Cut the knot: Visual Illusions
- A collection of about 20 illusions - all accompanied by Java applets. Interactively changeable attributes help investigate which ones are in fact responsible for tricking the brain.
- 48
- Mchael Bach: Optical Illusions & Visual Phenomena
- The stress here is on relative novelty and interactivity, in combination with a scientific background. Regularly updated.
- 54
- Skytopia - Dynamic Optical Illusions
- A selection of old, new and original optical illusions. Many pictures are enhanced via the use of 3D and animation.
- 57
- BrainDen.com: Brain Teasers and Riddles
- Classic puzzles and riddles sorted in several sections - general logic, weighing puzzles, Einstein's riddles, number sequences, and crossing river.
- 58
- Braingle's Riddles
- Contains thousands of popular riddles, as well as user submitted and rated riddles.