Directory: Top/Science/Math/Recreations

On the Puzzles with Polyhedra and Numbers
This is an article on a set of didactical games edited by the Portuguese Mathematical Society (SPM).
http://gfm.cii.fc.ul.pt/people/jrezende/jr_poliedros-puzzles_en.pdf
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Amazing Spiro
An applet for making spirograph graphs. Includes options for size, color and shape. Allows saving of completed image.
http://cgibin.erols.com/ziring/cgi-bin/spiro.pl/spiro.html
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A Mathematician's Aesthetics
In his classic A Mathematician's Apology, G. H. Hardy likened mathematics to poetry and painting. This site elaborates on Hardy's remark with quotations from Stevens, Klee, Fry, and Focillon. Links to related sites are given.
http://finitegeometry.org/sc/ph/aesthetics.html
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Stunning Friends with Math Magic
A collection of card tricks, number guessing games, paper and glue magic, and other math exercises.
http://www.cut-the-knot.org/arithmetic/rapid/magic.shtml
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Fast Arithmetic Tips
Three categories: defensive - know to check an answer, offensive - fast mental calculations, and math magic.
http://www.cut-the-knot.org/arithmetic/rapid/
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The Diamond 16 Puzzle
New version of the classic puzzle using row/column/quadrant permutations to display symmetries of graphic designs. Has link to a site on the underlying mathematics (Diamond Theory).
http://finitegeometry.org/sc/16/puzzle/
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Mathematical Spectrum
Mathematical Spectrum is a magazine for students and teachers of mathematics in universities, colleges and schools worldwide. It may be read by anybody interested in mathematics as a recreation.
http://www.apt.group.shef.ac.uk/ms.html
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The Eugène Strens Recreational Mathematics Collection
A special collection at the University of Calgary, including the archives of Martin Gardner. There is a searchable online index.
http://www.ucalgary.ca/lib-old/SpecColl/strens.htm
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Critical Math
Articles and images on recreational math from fractals and magic squares to mathemorchids and Galois.
http://www.gwywyr.com/articles/scimaths/
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Eric's Scientific Book List: Recreational Mathematics
Book list from Eric Weisstein including titles, authors, publishers, prices, page count and some have links to Amazon.com.
http://www.ericweisstein.com/encyclopedias/books/RecreationalMathematics.html
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