Group Puzzles (Sudoku Generalized)  Variations on Challenging Education Sudoku Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Fifteen Challenging Education Puzzles (numbers 1-15)
  4. Fifteen Challenging HyperEducation Puzzles (numbers 16-30)
  5. Twelve Challenging Education-X Puzzles (numbers 31-42)