| Alphametics Page [ Teens/Mature Teens ] - Explains this combination of arithmetic and words, and provides examples of several different types. http://members.aol.com/s6sj7gt/mikealp.htm |
| Nick's Mathematical Puzzles [ Teens/Mature Teens ] - A collection of an assortment of problems to try to solve, with hints, and solutions. Includes daily update feed link. http://www.qbyte.org/puzzles/ |
| The Exhibitionists [ Teens ] - Interactive, practical math puzzles relating to the management of a museum exhibit. Sponsored by the (British) National Museums Liverpool. http://www.liverpoolmuseums.org.uk/nof/maths |
| Torsten Sillke [ Kids/Teens/Mature Teens ] - A professor presents his extensive collection of puzzles which use counting, arithmetic, algebra and whole numbers. http://www.mathematik.uni-bielefeld.de/~sillke/ |