Mduque, all the pipe pieces are corners. By clicking on the blue dot, you can change it's orientation. The pipes have blue markers. By clicking on the blue marker you can change their orientation. Not all of the pipe connections have to be used. On my 2nd time thru I had 3 pipe locations that I did not use. The wheel turns on the water. The object is to get a fully connected pipe system so steam comes out of the steam whistle. When that happens, you'll get an object you'll need to apply in a different map. Good Luck