Space Cities News Today

>> reporter: meaning? >> you name it. >> reporter: others have built similar devices but this one is pretty unique. with help from dad, it was unlocking the mystery in no time. >> it took two minutes and 23.4 seconds. >> reporter: its kind of fragile. >> see this? thats an ultrasonic sensor. when its plugged into the wrong port, disaster can happen. >> reporter: as for the old-fashioned way to solve it -- >> i havent tried to solve one yet. >> i used to think that making lego cities, space citie...