Frank Longo

Skill Builder Sudoku: Hard to Expert (Skill Builder Sudoku)

Easy to Medium (Skill Builder Sudoku)

Skill Builder Sudoku: Medium to Hard (Skill Builder Sudoku)

Sit & Solve Tough Sudoku (Sit & Solve (R))

Sit & Solve Simple Sudoku (Sit & Solve (R))

Blockbuster Book of Sudoku

Peaceful Mind Book of Sudoku (Peaceful Mind Puzzles)

Help! Our Children Are Overweight!

Way Beyond Black Belt Sudoku (R) (Martial Arts Puzzles)

Sudoku Puzzles for Your Backpack (Puzzlewright Junior Sudoku)

Sudoku Puzzles for a Road Trip (Puzzlewright Junior Sudoku)

Sudoku Puzzles for the Weekend (Puzzlewright Junior Sudoku, #5)

Sudoku Puzzles for Vacation

Sinister Sudoku

Everyday Sudoku

Sophomore Year (Sudoku U)

Freshman Year (Sudoku U)

Bizarre Crossword Variants

The World's Longest Crossword Puzzles

Supersized Book of Sudoku

Absolutely Nasty® Crosswords Level 4

Absolutely Nasty® Crosswords Level 3

Sit & Solve® Bunny Slope Easy Sudoku

Brain Aerobics Wordoku 2