Group Puzzles (Sudoku Generalized) Medium Sudoku-by5 Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Twenty-Five Medium (DiffLev 5) Sudoku-by5 Puzzles (numbers 1-25)
  4. Twenty-Five Medium (DiffLev 6) Sudoku-by5 Puzzles (numbers 26-50)
  5. Twenty-Five Medium (DiffLev 7) Sudoku-by5 Puzzles (numbers 51-75)
  6. Twenty-Five Medium (DiffLev 8) Sudoku-by5 Puzzles (numbers 76-100)