grey object again. drag the id with the sequence onto the hand of the alien.
go twice to the right and click on the door of the hut. an alien will appear. click it to get a trowel. walk to the right. click on the hut on the right and write down the code behind him. go to the left again. go forward and climb up the bridge.
go forward, click on the lamp to see the clue (chessboard). enter the house and grab the wrench. click on ?back?. go forward and enter the house. click the symbols according to the hint on the grey stone behind the alien (click the positions 