Spite Cannon is a point and click physics based game you can play on addictinggames. Annyways, if you are trying so hard to hurt those purple blocks in that game but can't manage to get into some specific level then welcome to the club. I did a search for Spite Cannon walkthrough but it only returned me this video walkthrough by some guys over at youtube.
I would post the complete Spite Cannon walkthrough if I could find one. If you know of such complete guide to this game, perhaps you can share with us and you'll have many thanks and a round of applause =).