ElectroSudoku app for iPhone and iPad

It is a game to exercise the brain. It is a very difficult game so it is only recommended for people who have played before a more simple games.
It is a sudoku game type. You have one hour per level.

Each row must contain nine different electrical appliances.
Each colunma must contain nine different electrical appliances.
Each 3x3 box must contain nine different electrical appliances.

Click the button to check when you think the game has ended. If you have errors, are marked with a red square, to help you when you continue to play. If you check a few times, you get more points.