Group Puzzles (Sudoku Generalized) Tournament Sudoku-by5 Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Twenty Tournament (DiffLev 21-22) Sudoku-by5 Puzzles (numbers 1-20)
  4. Twenty Tournament (DiffLev 23-24) Sudoku-by5 Puzzles (numbers 21-40)
  5. Twenty Tournament (DiffLev 25) Sudoku-by5 Puzzles (numbers 41-60)
  6. Twenty Tournament (DiffLev 26-27) Sudoku-by5 Puzzles (numbers 61-80)
  7. Twenty Tournament (DiffLev 28-29) Sudoku-by5 Puzzles (numbers 81-100)