Group Puzzles (Sudoku Generalized) Medium Sudoku Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Forty-Five Medium (DiffLev 5) Sudoku Puzzles (numbers 1-45)
  4. Forty-Five Medium (DiffLev 6) Sudoku Puzzles (numbers 46-90)
  5. Forty-Five Medium (DiffLev 7) Sudoku Puzzles (numbers 91-135)
  6. Forty-Five Medium (DiffLev 8) Sudoku Puzzles (numbers 136-180)