Group Puzzles (Sudoku Generalized) Difficult Sudoku Six Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Twenty-Four Difficult (DiffLev 9-10) Sudoku-Junior Puzzles (numbers 1-24)
  4. Twenty-Four Difficult (DiffLev 11-12) Sudoku-Junior Puzzles (numbers 25-48)
  5. Twenty-Four Difficult (DiffLev 9-10) Sudoku-6up Puzzles (numbers 49-72)
  6. Twenty-Four Difficult (DiffLev 11-12) Sudoku-6up Puzzles (numbers 73-96)
  7. Twenty-Four Difficult (DiffLev 9) SuperSudoku-Junior Puzzles (numbers 97-120)
  8. Twenty-Four Difficult (DiffLev 10) SuperSudoku-Junior Puzzles (numbers 121-144)
  9. Twenty-Four Difficult (DiffLev 9) Sudoku-6up-UR-D Puzzles (numbers 145-168)
  10. Twenty-Two Difficult (DiffLev 10) Sudoku-6up-UR-D Puzzles (numbers 169-190)