Anonymous6 years ago000Which North Star Cube do I have to take to achieve the extension to 93sqm wet mopping?Show in original language (German)iRobot_Schweiz6 years ago000Hello AtschyCH, Please turn the cube over and check which number you have (4 or 2). If you already have a North Star Cube number 4, you need the number 2 as an extension, and vice versa. Thank you and best regards Your iRobot TeamShow in original language (German)Commentheidi.hagen6 years ago-101Since I don't understand the question, I can't give an answer. What is a North Star Cube?Show in original language (German)Comment