A happy challenge for dad on his birthday. He must complete 50 hard Sudoku puzzles in 50 days or less or else.

This is a Sudoku puzzle challenge for Grandpa's Birthday. He must complete 50 hard puzzles in 50 days - or at least before his next birthday. Can he do it? Except for the answers, it's all large print, so Grandpa has no excuse for not trying this fabulous 50-50 Sudoku challenge.

A get well wish and challenge for a dear Grandpa involving not one but four different puzzles. While recovering, Grandpa is supposed to complete 40 easy, medium, and hard puzzles in 40 days or less, and more importantly, be healthy once again by then.

A get well wish for a dear dad recovering from illness. To keep him busy, here's a multi-puzzle challenge consisting of 40 puzzles to be completed in no more than 40 days. Dad should be back to "normal" by then.

A Merry Christmas Sudoku challenge to complete 50 hard puzzles in 50 days or less. It comes with large print and includes solutions. This paperback makes for a great and inexpensive holiday gift for anyone.

A Christmas Sudoku puzzle challenge for dearest Dad to be completed in 50 days or less. Can he do it? It makes for a unique holiday gift.

One lovely Christmas Sudoku puzzle challenge exclusively for Grandpa to complete 50 puzzles in 50 days or less... or else. It makes for a unique holiday present.

How about a unique Christmas gift for Dad? Can Dad complete Sudoku, Word Search, and Cryptogram puzzles (20 each) in 30 days or less? There's only one way to find out.

A fun Christmas gift for Grandpa consisting of a challenge to complete Sudoku, Word Search, and Cryptogram (20 of each) in 30 days or less. Can he do it without help? Hmm...