9 digits

Play 4 brain teasing logic games - with thousands of puzzles.

Enjoy classic Sudoku and try the X-Sudoku variation or use your math skills to solve Killer Sudoku and MathDoku puzzles!

Don't get stuck - 9 digits' helpers guide your next move and teach you solution strategies.

9 digits was created by people who love to play logic games!

  • four logic games
  • don’t ever get stuck using step-by-step hints
  • easily enter digits and pencil marks
  • unique solutions, no guessing needed
Requires iOS 7.0 or later. Compatible with iPhone® and iPod touch®.


Play classic Sudokus or have a go at Killer Sudoku, X-Sudoku or MathDoku. Start with a beginner’s difficulty level or directly opt for master.

In Sudoku a digit must occur only once in a row, a column and a 3x3 block. The X-Sudoku variation adds the diagonal lines to the set of constraints.

To solve Killer Sudokus or MathDokus some math skills are required to figure out the correct digits on the board.

Ask for help and 9 digits explains the next solution steps in detail and shows the strategy to use.

Each digit has its own color which is also used for the pencil mark. So both digit and color help your brain to quickly check the puzzle and make your next move.


Version 1.3.2

Released on May 14th, 2014
  • NEW new setting to hide the game timer
  • NEW new setting to autofill cells with single pencil marks
  • NEW lots of minor user interface tweaks
  • FIX prevents accidental input while using system gestures on iPad

Version 1.3

Released on January 3rd, 2014
  • NEW all new design for iOS 7 heavily supported by Giorgio Calderolla
  • FIX replaced Pro Killer Sudoku #24 in Pack 3
  • FIX game timer is now working correctly

Version 1.2.1

Released on March 22th, 2013
  • NEW new icon designed by Girogio Calderolla
  • NEW support for iOS 6 and iPhone 5

Version 1.1

Released on November 6th, 2012
  • NEW access to all puzzle packs, game is completely free now
  • NEW play mono color games (disable colored digits in settings)
  • NEW tilt your iPhone/iPod to rotate the puzzle by 90 degrees
  • NEW added new Exotic Pro Puzzle Pack
  • NEW updated background image

Version 1.0

Released on July 12th, 2011
  • NEW initial release



Contact us



As required in §5 TMG:
Marcus Wagner
Frankfurter Str. 78
64546 Mörfelden