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/ Freepuzzles.com~Site InfoWhoisTrace RouteRBL Check
Aha! Puzzles Puzzles, books, games and tests with designed by Lloyd King, author of "Test Your Creative Thinking". http://www.ahapuzzles.com Ahapuzzles.com~Site InfoWhoisTrace RouteRBL Check
Polyhedra Links Pastime and activity links for various geometric patterns, polygons and polyhedra by Jill Britton. http://britton.disted.camosun.bc.ca/jbpolyhedra.htm Camosun.bc.ca~Site InfoWhoisTrace RouteRBL Check
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/numeric/index.html Bigpond.com~Site InfoWhoisTrace RouteRBL Check