Alphametics Page [ Teens/Mature Teens ] - Explains this combination of arithmetic and words, and provides examples of several different types.
Erich's Puzzle Palace [ Kids/Teens ] - Original games using triangles, numbers, squares, equations.
The Exhibitionists [ Teens ] - Interactive, practical math puzzles relating to the management of a museum exhibit. Sponsored by the (British) National Museums Liverpool.
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.
Torsten Sillke [ Kids/Teens/Mature Teens ] - A professor presents his extensive collection of puzzles which use counting, arithmetic, algebra and whole numbers.
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