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1. 15 Puzzle of Sam Lloyd

Play online Sam Lloyd's "15" puzzle. The funny story and mathematical implications of this game. Some funny logical problems with the 15 game.

http://www.holotronix.com/samlloyd15.php

2. A Primer on Cryptarithmetic

Instructions, examples, references and links.

http://www.geocities.com/Athens/Agora/2160/pr...

3. A+ Math

Interactive math help for K-12 students with flashcards, Math Wordfind, Homework Helper and worksheets.

http://www.aplusmath.com/

4. AIMS Puzzle Corner

Provides over 100 puzzles with the goal of creating an engaging learning environment.

http://www.aimsedu.org/puzzle/

5. Aha! Puzzles

Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking".

http://www.ahapuzzles.com

6. Algebraic Math Puzzles

A collection of puzzles at high school level. Does not include answers.

http://www.lifesmith.com/mathpuz1.html

7. Alien Tiles

Object of puzzle is to try to get color pieces to create certain patterns in cube.

http://www.alientiles.com/

8. Alphametic Puzzles

Numerous puzzles, links, puzzle solver, and a generator.

http://www.tkcs-collins.com/truman/alphamet/

9. Alphametics Page

Compiled by Mike Keith. Examples of various genres.

http://members.aol.com/s6sj7gt/mikealp.htm

10. Archive Creative puzzles

Interactive puzzle archive with descriptions for puzzle construction and a special children's puzzle page.

http://www.creativepuzzels.nl

11. Ben Robinson's Cross-Number Puzzles

A collection of cross-number puzzles: similar to crosswords, but using digits instead of letters. Many involve complex mathematical reasoning.

http://www.users.bigpond.com/bendr/xwd/numeri...

12. Brain Teasers and Maths Puzzles

Interactive logical and mathematical puzzles with feedback and detailed solutions.

http://www.syvum.com/teasers/

13. Brain Teasers by QBrute

Original brain teasers with solutions.

http://www.angelfire.com/empire/qbrute/

14. Calculus-Help Problem of the Week Archive

Calculus based problems range from easy to difficult.

http://www.calculus-help.com/problem.html

15. Colorful Mathematics

Educational software presents advanced mathematics to K-12 students in a game-oriented approach, using coloring and drawing techniques to illustrate concepts from graph theory and computer science.

http://www.math.ucalgary.ca/~laf/colorful/col...

16. Contest Center Cryptarithms

Examples of cryptarithms, with prize competitions for subscribers.

http://www.contestcen.com/rithms.htm

17. Dick's Math Puzzle Page

A collection of mathematical puzzles, some original, with fully worked solutions.

http://www.mod2.org/

18. Downloadable and online games

A variety of Flash- and Java-based games and puzzles.

http://www.gameintellect.com/

19. Free Puzzle Collections

Educational and recreational puzzles for teachers, students and parents. Each puzzle is graded by difficulty and has a hint. Solutions are available to members.

http://www.freepuzzles.com/

20. Group Games

Animations that develop the theory behind such puzzles as the Rubik cube.

http://www.dmi.units.it/~logar/duek2/index_en...

21. Interactive Mathematics Miscellany and Puzzles

Java-based math resource including articles, puzzles and links.

http://www.cut-the-knot.org/

22. Logic Puzzles

Collection of original numerical-logic puzzles. Many are long and difficult, involve sorting and comparing long lists and are intended to be solved using a good spreadsheet program.

http://www.geocities.com/bob_kraus_2000/

23. Logicville

Educational puzzles, brain teasers, and word games such as anagrams, cryptograms, alphametics, doublets, tangrams.

http://www.logicville.com/

24. Magic Math Kingdom

Learn math through games and quiz-oriented tutorial.

http://www.nes-lab.com/english2/

25. Math Puzzles

Logic puzzles and riddles with some solutions.

http://www.math.utah.edu/~cherk/puzzles.html

26. MatheMagic

A collection of mathematical puzzles, jokes and articles.

http://geocities.com/mathimoh/

27. MatheMajik

Indian site featuring calculation tricks and math puzzles.

http://mathemajik.tripod.com/

28. Mathematical Games

A collection of pencil and paper games with mathematical content. Many can be played through the site.

http://www.madras.fife.sch.uk/maths/games/

29. Mathematical Recreations

Detailed exploration of a selection of mathematical topics.

http://www.mathrec.org/

30. Mathproblems.info

Over one hundred and fifty math problems ranging from basic math to differential equations.

http://mathproblems.info/

31. Mathpuzzle.com

Celebrates math puzzles and mathematical recreations.

http://www.mathpuzzle.com/

32. Mathschallenge.net

A website dedicated to the puzzling world of mathematics, with a discussion forum.

http://mathschallenge.net/

33. Mathschallenge.net

A website dedicated to the puzzling world of mathematics.

http://mathschallenge.net/rss2.xml

34. Mathwizz

Interactive math problems for abilities ranging from middle school to university.

http://www.mathwizz.com/

35. Mixed Up Math

Logic problems, where equations are mixed up. In various formats like boxes, crosses, diagonals, mazes. Free download.

http://www.kprobe.com/kprobe/mu.htm

36. Mr Titen's More Than Math

Mathematics teacher provides puzzles for students.

http://www.geocities.com/EnchantedForest/Towe...

37. Nandor's Exhaustive Chemical Words Pages

Lists all the English words, word squares, and magic squares that can be written using chemical symbols.

http://www.wellington.org/nandor/chemwords/ch...

38. Nick's Mathematical Puzzles

A collection of puzzles, with hints, solutions, and links to related mathematical topics.

http://www.qbyte.org/puzzles/

39. Nick's Mathematical Puzzles

A collection of puzzles, with hints, solutions, and links to related mathematical topics.

http://www.qbyte.org/puzzles/rss2.xml

40. Paul Hsieh's Puzzles

Logical and mathematical brain teasers, with an indication of difficulty. Hints are provided; solutions are available by email.

http://www.azillionmonkeys.com/qed/puzzles.ht...

41. Perfect Times

Teaches and assesses fluency of multiplication and division tables using online cards. Submit data and compare results.

http://www.perfect-times.co.uk/

42. Polyhedra Links

Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton.

http://britton.disted.camosun.bc.ca/jbpolyhed...

43. Polymorf - Symmetry of Polyhedra

A demonstration of the symmetry and transformational properties of the Platonic and Archimedean solids.

http://www.polymorf.net/

44. Puzzle of the Week Archives

A collection of puzzles, with hints and full solutions. Compiled by George Moody.

http://ecg.mit.edu/george/puzzles/

45. Puzzles of Leonid Mochalov

A variety of challenging geometrical and arithmetical puzzles, many with solutions.

http://puzzlemochalov.com/

46. Pythabacus

Description and instruction of using the ancient Pythagorean Abacus to do arithmetic.

http://www.pythabacus.com/

47. SMSU Problem Corner

Math challenges Southwest Missouri State University in three levels of difficulties.

http://math.missouristate.edu/~les/POTW.html

48. Scott Kim

Puzzles for web, computers, and print; ambigrams.

http://www.scottkim.com/

49. Storkey: Two Envelope Paradox

A tough but simply defined problem which demonstrates key issues in probability.

http://www.anc.ed.ac.uk/~amos/doubleswap.html

50. The Contest Center

Classic puzzles and riddles requiring only simple logic and elementary math.

http://www.contestcen.com/classic.htm

51. The Enigmatic World of Philip Carter

Collection of brain teasers from the author of IQ books.

http://www.knowl.demon.co.uk/

52. The Little Math Puzzle

The Little Math Puzzle has been a K-12 Internet activity since 1995 for grades 5-9. Currently the puzzles have ceased but the site maintains complete archives of past problems.

http://www.sprucelog.com/lmp/

53. The Puzzling World of Barry R. Clarke

Brain teasers, articles and puzzles forum.

http://barryispuzzled.com/

54. Torus and Klein Bottle Games

Collection of Java-based educational puzzles.

http://www.geometrygames.org/TorusGames/index...

55. Wu's Riddles

A collection of riddles, puzzles, and technical interview questions, with a discussion forum.

http://www.ocf.berkeley.edu/~wwu/riddles/intr...

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