Solution of the game
————————-
BE AWARE THAT THE VIDEO BELOW REVEALS THE SOLUTION OF THE GAME! IF YOU WANT TO SOLVE IT ON YOUR OWN PLESE DO NOT WATCH IT, NOR READ THE REST OF THIS ENTRY.
solution:
http://www.youtube.com/watch?v=wy-NdCOpgnQ
The trick is pressing the right button of your mouse on your last move. Start drawing a normal line to the circle, right click near it, move your mouse to the bottom corner of it and press left button again to continue drawing the line. The game doesn’t give any warnings while the popup screen is open.
It is not a logical puzzle, instead a tricky one, but they didn’t express that the game has a scientific solution.
If you find this video usefull, a warm comment will be welcomed.