Sudoku Challenge is designed to train your brain to react faster / smarter and having a fun time doing it. it offers the ability to customize it to the kind of sudoku you want to play.

Unlike other sudoku games Sudoku Challenge offers landscape game play so you don't have to squint to see the board.

Depending on your skill level of sudoku it has you covered with 4 levels of difficulty.
Easy for beginners to learn how to play the game.
Medium to help train your brain to react faster and smarter.
Hard to skilled sudoku players
Impossible for an extreme challenge.

It offers multiple dark themes to be easy on your eyes and look beautiful doing it and light themes for users that don't want to be put to sleep while playing.

Features Include:
* Portrait Game Play
* Landscape Game Play
* Ability to write notes
* Mistakes counter that can either end the game after 3 or just keep track of them.
* Timer that can be turned off or on
* 6 well balanced themes that offer dark and light options.
* Auto complete option when only 8 options are left.
* Auto Clear notes
* 4 difficulty
* Autosave
* Display errors right away (can be turned off)
* Unlimited undo/redo
* Unlimited hints
* Ability to pause
* Reset the board
* Erase cells
* Prevent screen from locking
* Hide completed numbers
* Show all cells that need to be looked at to make a decision
* Many settings can be turned on or off to customize game play
* An advanced hint system that teaches you how he found a number or a simple hint that will help you get unstuck without explaining how it got the answer.