I appreciate your kind words. It really means a lot. I do agree Level 4 is too hard to be the fourth, if not the hardest, and I'm not saying that to make you feel better. You will figure out. I believe in you!
It was so hard to figure out by myself that how to complete a particular level. There was not a single clue just a small hint that you gave at starting "mouse and keyboard" helped me a lot in only 3 or 4 levels maybe. also I forgot to tell about lvl 11. I started thinking that there is no way that I can complete the lvl, after playing for 15 minutes I gave up and voila I got the solution lol.
This time I was speed running.