

Very Challenging Puzzles
Here is the section of our Puzzle Book Ninja website reserved especially for puzzle solvers who love more challenging puzzles. Themes are varied, puzzle types are varied. Puzzles support brain health, activate the puzzle ninja within, and stimulate creativity. Check back often for new challenging puzzles.
Calcudoku Puzzles
Challenging Word Searches
Crossword Puzzle Bundle-A
Crossword Puzzle Bundle-B
Crossword Puzzle Bundle-C
Crossword Puzzle Bundle-D
Cryptolist Puzzles-Chemistry-Periodic Table
Division Sudoku Puzzles
Samurai Sudoku Puzzles - Beginner (Easy)
Sudoku Printable Bundle D-Challenging
Synonyms for 'Nonsense' Puzzles