The last puzzle was so difficult. I got a friend to help me, and we were barely able to solve it together. Try to solve it yourself before copying our solution. Here's the solution, if you can understand my encoding:
XXX.XXX.OXX.X
X.XXX.OXX.XXX
X.XXO.XXX.XXX
XXX.XXO.XXX.X
XXX.XXX.OXX.X
X.XXX.OXX.XXX
X.XXO.XXX.XXX
......O......
Paste this into a monospace font notepad app to read it.