Normal sudoku rules apply: place digits 1-6 into every row, column and 3x2 box, once each. There are cars on the grid, and they carry given digits. The cars could be moved forward and backward in their direction, but they cannot drive through another car or through the grid border (they cannot escape from the grid). The given digits on the cars drive together with the car. Software tips: - Use the move button (4 arrows) for moving the cars. - You can hide the cars by pressing the yellow car button.