The aim here is to move the crosshair to the marker on the railway, which is the second square from the left on the top row. To use the lever on the left, just click on the slot that you wish to move it to. The correct order is
left down, up right, left down, up right, left down, down right, up right, left down, up right. You can use the reset button on the right if you make a mistake. Droggeljug!