Aridoku

Aridoku is a number placement game based on arithmetic and logic.The numbers 1 to 9 should be placed in the empty squares on the grid in such a way that each number appears only once and when calculations are made with the operators plus, minus, multiply or divide, the result matches the values in the shaded squares. Calculations must be made left to right or top to bottom, with division being exact.To aid the solution, possible values can be placed in a square by first touching the 'pencil' checkbox. The 'group' checkbox is used when a pair of values fits a pair of squares. In this case those values cannot appear anywhere else in the puzzle and those values can be removed from the'possibles' at the foot of the screen.Any number of puzzles can be played, since they are generated automatically.