Starting Bubbles: 35 bubbles
You will have to do almost only angle shots at level 4, build one green spider and let the ceiling free by bursting two different rows of bubbles. That is actually very simple! Good luck!
If you feel that you need some more training for level 4, please scroll down and watch FaceBookSpiele.de’s video. The music is techno, so turn it down, if you are at work or the kids are sleeping. ;)