Optimized for the iPhone 5 and iOS6. It's been called the "Best Sudoku Game on ANY platform". Big Bad Sudoku Book has great animation and is an essential game for every iPhone and iPad.

Big Bad Sudoku Book held the #1 spot as most download iPad app in 8 countries, and in the top 10 games in 56 countries. It's been featured by Apple in What's Hot, New and Noteworthy, Game Center Games, and Game Starter Kit. There's a reason everyone loves Big Bad Sudoku Book. Try it for free right now!

Read our reviews and see what real users are saying about the new version:

★★ "If Apple made a sudoku game I think it would look like this" - Dytavio ★★

★★ "The whole look is perfect... This is the best sudoku interface of the five sudoku apps I have downloaded. I suspect the rest will be removed from my iPad" - GrayerBeard ★★

Most other sudoku games in the store don't allow you to enter wrong numbers. They don't allow you to make mistakes? What's the fun in that? They'll either bounce the number back or immediately show that the cell is wrong. There's a reason that people who love sudoku love Big Bad Sudoku Book.

Puzzle scoring brings an arcade game feel to sudoku and provides a metric for challenges. Sudoku Book uses an exclusive method of scoring games based on the difficulty of each answer - not based on time. Now there are two parts to the puzzle, how to solve it and how to get a higher score.

We listen to our users and have added many features based on user requests. Tech support is available within the app as a direct email to the developer. And we respond. Already in version 3 we've been in contact with many users and are fixing things based on their input.

★★ The "Best Sudoku got better. Still the most like pen and paper. I love the interface. New changes made the best better." - pluto6 ★★

All puzzles are guaranteed to have a single solution and be solvable without guessing. Harder puzzles do require some advanced solving techniques.

Also added are many new user requested features like auto removal of marks, number counts (how many of each number is on the board), and the ability to turn off manual highlighting and the mistake smudges.