US Puzzle and Sudoku Championships
University of Maryland Fermi Problems Site
The Select-A-Map Personalized Jigsaw Puzzle. at Hammacher Schlemmer
Índice de páginas educativas y Beatles
Generador on-line de sopas de letras. Sencillísimo de usar. Se pueden imprimir o copiar el código y pegarlo en tu sitio web donde los visitantes podrán resolverla on-line
[ wu :: riddles(easy) ]
Schmies Vocabulary Test
Microsoft Interview Questions.
The Universe of Discourse : The envelope paradox
Drunk Men Work Here
INTERNATIONAL HIGH IQ SOCIETY | Iq Tests
These imponderables are here to encourage my students to think cre ...
List of paradoxes - Wikipedia, the free encyclopedia
3quarksdaily
Rope burning logic problem (kottke.org)
hole_in_triangle.jpg (JPEG Image, 624x588 pixels)
Periodically-updated collection of puzzles. A good way of wasting a few minutes.
Logic Mazes
techInterview - puzzles and interview questions
Exidor's Logic Puzzle Place