Quoted from freddo30:
One reason that it's critical to have correct polarity in this particular game is that a bridge rectifier is utilized to convert AC to DC in order to provide sufficient oomph to start the doodle bug feature. Incorrect switching of hot/com will destroy said bridge rectifier. The protective fuse will immediately blow and the feature will be rendered inoperative.
There is no rectifier in this game. The magnet runs off 110v directly.