Group Puzzles (Sudoku Generalized) Perplexing Sudoku-by5 Logic Puzzles, Volume 1.
  1. Teaching Logic using Group Puzzles
  2. Solving Group Logic Puzzles
  3. Twenty Perplexing (DiffLev 45-47) Sudoku-by5 Puzzles (numbers 1-20)
  4. Twenty Perplexing (DiffLev 48-50) Sudoku-by5 Puzzles (numbers 21-40)
  5. Twenty Perplexing (DiffLev 51-53) Sudoku-by5 Puzzles (numbers 41-60)
  6. Twenty Perplexing (DiffLev 54-56) Sudoku-by5 Puzzles (numbers 61-80)
  7. Twenty Perplexing (DiffLev 57-60) Sudoku-by5 Puzzles (numbers 81-100)