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iSudoku light

By Wolfgang Trumler

This app is only available on the App Store for iOS devices.


If you like Sudoku you will love iSudoku light, the only Sudoku for the iPhone that offers four different Sudoku types including Sudoku Plus with two overlapping puzzles and Samurai Sudoku that consists of five overlapping Sudokus. Furthermore, you can manually enter your favorite puzzle via the newspaper mode. iSudoku Light has a nice and clean user interface for a unique experience on the iPhone. Play the traditional Sudoku, Sudoku X, Sudoku Plus, Samurai Sudoku or enter your own puzzle. Five difficulty levels span from very easy Sudokus for beginners to very difficult ones for the experienced users.

The Samurai Sudoku consists of five overlapping puzzles and Sudoku Plus offers two overlapping puzzles that span beyond the screen size. To show the other parts of the puzzle you can scroll and zoom the puzzle as needed. If you tap the hint button to get some help the screen automatically scrolls to the field, which is animated to show the hint.

To make life easier, you can select some options like highlighting the row and the column of a chosen field or you can use the immediate number checking to show wrong numbers in red.

Once you get stuck, the sophisticated hint system can help. The hint system employes well known strategies to rate the difficulty level of field's solution. If you request a hint the hint system always shows the hint with the lowest difficulty level first. Furthermore, you can also request to show the corresponding number of a field.

The hint system can generate pencil marks for you that automatically change depending on the numbers you enter. You can choose from four different reduction levels for the pencil marks. The hint system can only create the pencil marks with all possible numbers of a field or it can reduce the pencil marks by applying reduction methods, a human player normally employes to find the next number. But be careful, the highest reduction level will solve most of your puzzles.

iSudoku Light supports three languages: english, german, and french. I would like to thank Pierre-Yves Bessuand for the french translation.

- enter your own puzzle in the newspaper mode
- play Samurai Sudoku, Sudoku Plus, Sudoku X, or traditional Sudoku
- four difficulty levels
- automatic pencil marks that change corresponding to the users input
- sophisticated hint system for all kind of players
- highlighting of rows and columns
- immediate number check shows wrong numbers in red
- puzzles can be restarted
- integrated user manual and a quick start guide
- clean and intuitive user interface for a great user experience
- unintrusiv user interface (no overlays for numbers and pencil marks)
- all on one screen for optimal overview
- beautiful animations
- progress is automatically saved on exit

What's New in Version 2.6.1

Bug fix release

iPhone Screenshots

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Customer Reviews

Intrusive advertisements

The program works fairly well but the advertisements not only cover up the menu button but also creep over the game space by a few pixels. This would not be a big deal except that the zoomed in puzzle won't scroll past the edge at all- you end up opening adverts when you wanted to input a number.

Adding a black border around the sudoku and samurai sudoku game space would remedy this problem so here's hoping for future updates.


I live this version of the available Sudoku game, especially the overlapping puzzles. I'd give it more stars if it looked like there were going to be updates to keep it compatible with future IOS updates. I even considered buying the paid version but since neither have been updated since 2012, I guess they aren't interested in supporting their product.

Newspaper mode needs to support samurai sudoku

I am looking desperately for an app that allows me to input a samurai sudoku puzzle, and then solve it, or work on it… this app was ALMOST the ticket, until I found out that it does not do "newspaper mode" for samurai sudoku… only for standard 9x9… FAIL. Please add this function!

iSudoku light
View in iTunes
  • Free
  • Category: Games
  • Updated:
  • Version: 2.6.1
  • Size: 2.0 MB
  • Languages: English, French, German
  • Seller:

Compatibility: Requires iOS 3.1 or later. Compatible with iPhone, iPad, and iPod touch.

Customer Ratings

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