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Erich's Puzzle Palace
Original games using triangles, numbers, squares, equations.
www.stetson.edu/
Diamond 16 Puzzle
Rearrange rows, columns, and quadrants in a 4x4 array of 2-color squares to solve the puzzle and to make a variety of symmetric designs.
m759.freeservers.com/
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.
www.sprucelog.com/
Puzzle Fun
Newsletter edited by Rodolfo Kurchan about pentominoes and other math problems.
www.eldar.org/
A Puzzle by Enrich Friedman
Every square can be dissected into L-ominoes. Can every Pythagorean square? Conjecture needs proof.
www.math.uic.edu/
Multiplication Practice with Puzzle Grid
Practice multiplying 3 digits by 2 digits. Solve the problems; then find the answers in the puzzle grid.
www.lessontutor.com/
Puzzle of the Week Archives
A collection of puzzles, with hints and full solutions. Compiled by George Moody.
ecg.mit.edu/
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.
www.freepuzzles.com/
Ken Duisenberg's Puzzle of the Week
Problem archive and puzzle links.
ken.duisenberg.com/
15 Puzzle of Sam Lloyd
Play online Sam Lloyd's "15" puzzle The funny story of this game Mathematical implications of this game Some funny logical problems with the 15 game.
www.holotronix.com/