Simple MathDoku is a mathematical puzzle game that combines the classic Japanese number puzzle game of Sudoku with mathematical equations. The aim of the game is to fill a 9x9 grid with numbers in such a way that each column, row and 3x3 box contains the digits 1-9, and the sum of the numbers in each box must equal the given target number. The player is presented with a number of given numbers and must use basic math operations (addition, subtraction, multiplication and division) to determine the remaining numbers. The game is a fun and challenging way to practice basic math skills as each puzzle requires the player to solve equations as well as use logic to complete the grid.
Discontinued It seems that the project is no longer updated, but the latest version, 2.2.0, released in July 2012, is fully functional and can still be downloaded from the official website.