Killer Sudoku by Logic Wiz

Killer Sudoku is a puzzle and math game by Logic Wiz it is a free entertaining logic game and brain training app, joining a family of Sudoku and Logic games developed by Logic Wiz.
The puzzles are beautifully handcrafted and divided into 6 playing levels from Beginner to Master.
The app comes with a great interface and tools for novice and professional solvers, like: Hidden(virtual) cages creator, combination panel, killer calculator, double notation.
Smart hints show the next logical step to overcome hurdles and help you become a better player.
The Logic Wiz Sudoku free app was chosen as the Best Sudoku App and the Best Brain Training App.

About Killer Sudoku:

The board has dotted lined polygons — called "cages". Most of the times, there is a number at the top left corner the cage.
Rules:
1. The number at the top left corner of each cage is the sum of all the digits in the cage.
2. A digit can only appear once in each cage.
3. Only rule 2 applies for cages without sum.

Puzzle Features:

* Beautiful handcrafted boards.
* Unique solution to each puzzle.
* All boards designed and created by Logic-Wiz.

Game Features:

* Smart Hints to help and teach.
* Weekly Challenge.
* Gallery game view.
* Play multiple games concurrently.
* Killer Calculator.
* Combinations panel for Killer cages
* Hidden( Virtual) cage creator.
* Cloud Sync - Synchronize your progress over multiple devices.
* Keep Screen Awake.
* Light and Dark Theme.
* Sticky digit mode.
* Remaining cells of a digit.
* Select multiple cells at once.
* Select multiple cells at distributed locations of the board.
* Multiple pencil marks styles.
* Double notation.
* Auto remove pencil marks.
* Highlight matching digits and pencil marks.
* Multiple error modes.
* Performance tracking for each puzzle.
* Statistics and Accomplishments.
* Unlimited Undo/Redo.
* Various cell marking options- highlights and symbols
* Track and improve solving time.
* Board preview.
* Reset Level
* Mobile Phones and Tablets.