Mathdoku & Killer Sudoku

MathDoku & Killer Sudoku (Package Name: com.klokisoft.mathdokuext) is developed by InfoHyla and the latest version of Mathdoku & Killer Sudoku 4.22 was updated on November 17, 2025. Mathdoku & Killer Sudoku is in the category of Puzzle. You can check all apps from the developer of Mathdoku & Killer Sudoku and find 200 alternative apps to Mathdoku & Killer Sudoku on Android. Currently this app is for free. This app can be downloaded on Android 8.0+ on APKFab or Google Play. All APK/XAPK files on APKFab.com are original and 100% safe with fast download.

Mathdoku and Killer Sudoku for Masters!
We made this game for ourselves to play it daily. So we have introduced a lot of tools to skip trivial parts of the both Mathdoku and Killer Sudoku and have fun only with challenging parts.
Avoid boring tapping with these unique features:
- start the game with smartly filled cells with 'maybes' only with possible digits according to the rules for Mathdoku and Killer Sudoku
- long tap cells with 2 or 3 'maybes' to remove trivial 'maybes' in other cells in the same row/column/cage/segment
- lazy mode option in settings to automate trivial solutions (be careful, it's for real Masters)
Help yourself with hard puzzles using these features:
- integrated DigitCalc, a simple calculator that computes all possible combinations of digits in selected cage considering already resolved cells and whether duplicates are allowed.
- set checkpoint by long tapping undo button and rewind to it whenever you want
- option to sum numbers in cages to help in Killer Sudoku solving
- check if solved cells are correct
Rules
As in Sudoku, for both Mathdoku and Killer Sudoku digits may appear only once in each row and column. But unlike Sudoku, these games also have so-called cages..
Each cage in the first cell has a number and an arithmetic operation. The number should be the result of that arithmetic operation using all the digits inside the cage. E.g. '5+' means that all the digits in that cage add up to 5. The order in which the digits are used in the cage is not relevant. Obviously, in Mathdoku only two-cell cages can have a subtraction or division operation.
Mathdoku specifics:
- grid size from 4x4 to 9x9
- all four basic arithmetic operations are used
- digits can be used more than once per cage
Killer Sudoku specifics:
- grid size 9x9 only
- only sum operation in a cage
- no repeating digits inside cage

- grid is divided into nine 3x3 quadrants for which the same rules apply
Detailed help and tutorial are available in the game menu. You can also watch YouTube on how to play Mathdoku from Google Play listing or directly from the game.
This game is a descendant of "Mathdoku extended" which had a bunch of loyal players due to the cleanest design and playfulness of all the variants you can find.
You can play one game daily for free and additional just by watching ad. Short intermediate pop-up ads, which will NEVER pop up during the game, could be avoided for a small amount of money, forever!
We consider coin system to be fairer than a subscription, so you only pay (or watch an ad) for the games you play on top of the daily freebies.
If you like our work, have some suggestions or complaints, feel free to contact us at:
infohyla@infohyla.com

MathDoku & Killer Sudoku 4.22 Update

4.22
- more robust store system
- minor fixes