Very Hard Puzzle

Independently published

Expert Sudoku for Brain Health 100 Very Hard Puzzles: 12x12 Grid One puzzle per page 6x9 handy size Solutions Included For Adults Seniors Teens

CreateSpace Independent Publishing Platform

Very Hard Difficulty Sudoku Puzzles Volume 1: 200 Very Hard Sudoku Puzzles For Advanced Players

CreateSpace Independent Publishing Platform

Very Hard Sudoku Puzzles: Very Hard Sudoku Puzzles For Advanced Players

Independently published

500+ Sudoku Puzzles Hard to Very Hard: Sudoku Puzzle Book for Adults

SUDOKU Puzzles - Hard to Very Hard: Puzzles + Solutions by Steve Soto (2009-12-01)

CreateSpace Independent Publishing Platform

Very Hard Sudoku Puzzles Volume 3: Very Hard Sudoku Puzzles For Advanced Players

St. Martin's Griffin

Will Shortz Presents the Dangerous Book of Kenken: 100 Very Hard Logic Puzzles That Make You Smarter

Independently published

Very hard puzzle book                            

CreateSpace Independent Publishing Platform

200 Very Hard Sudoku Puzzles Volume 2: Very Hard Sudoku Puzzles For Advanced Players

Independently published

Hashi - 108 Puzzles; Very Hard; Volume 2; Large Print (Cactus Puzzles): 1 puzzle/pg,1 solution/pg; 8.5" x 11"; 21.6 x 27.9 cm; 30x30 grids