Group Puzzles (Sudoku Generalized) Difficult Sudoku Five Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Twenty-Four Difficult (DiffLev 9) Sudoku-5 Puzzles (numbers 1-24)
  4. Twenty-Four Difficult (DiffLev 10) Sudoku-5 Puzzles (numbers 25-48)
  5. Twenty-Four Difficult (DiffLev 9) Sudoku-5-Spot Puzzles (numbers 49-72)
  6. Twenty-Four Difficult (DiffLev 10) Sudoku-5-Spot Puzzles (numbers 73-96)
  7. Twenty-Four Difficult (DiffLev 9) Sudoku-5B Puzzles (numbers 97-120)
  8. Twenty-Four Difficult (DiffLev 10) Sudoku-5B Puzzles (numbers 121-144)
  9. Twenty-Four Difficult (DiffLev 9) Sudoku-5C Puzzles (numbers 145-168)
  10. Twenty-Two Difficult (DiffLev 10) Sudoku-5C Puzzles (numbers 169-190)