• The Math Forum @ Drexel University
  The Math Forum Is... ... the leading online resource for improving math learning, teaching, and communication since 1992. _We are teachers, mathematicians, researchers, students, and parents using the power of the Web to learn math and improve math education. _We offer a wealth of problems and puzzles; online mentoring; research; team problem solving; collaborations; and professional development. Students have fun and learn a lot. Educators share ideas and acquire new skills. _
  The Math Forum is the comprehensive resource for math education on the Internet. Some features include a K-12 math expert help service, an extensive database of math sites, online resources for teaching and learning math, plus much more.
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• Web Sudoku - Billions of Free Sudoku Puzzles to Play Online.
  Billions of Free Sudoku Puzzles to Play Online. Each Sudoku has a unique solution that can be reached logically without guessing. Enter digits from 1 to 9 into the blank spaces. Every row must contain one of each digit. So must every column, as must every 3x3 square.
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