MathDoku is a free puzzle game available on Android that is based on the same rules as the popular KenKen game, as printed in the New York Times and The Times (UK). This game is perfect for puzzle enthusiasts who love a mathematical challenge.

In MathDoku, players are presented with a grid of squares, similar to Sudoku. However, each square is part of a cage that has an arithmetic challenge. The player must use the arithmetic challenges in each cage to help solve the puzzle. The game provides a range of difficulty levels, making it suitable for players of all ages and skill levels.

MathDoku is licensed under the GPL, and the source code is available for those who want to customize the game. The game was authored by Ben Buxton and Paul Dingemans, with contributions from Pimm Hogeling, Stephen Lee, Alexander Tesfamichael, and Anthony Paul.

Overall, MathDoku is a fun and challenging game that puts a mathematical twist on the classic Sudoku puzzle. It's a great choice for puzzle lovers who are looking for a new and exciting challenge.