"None of the above packman simply walks, it's just the camera angle theat makes him apear to have no limbs."
...by that logic....wouldn't his head open sideways?
The worm-hole one is the closest.
What he's actually doing is altering the strong nuclear force of matter; a bit stronger in front, and a bit weaker behind. This perpetually 'pinches' the space behind him while 'pushing' it out the back, which results in what appears to be forward momentum. He is, in effect, within a self-induced bubble of space-time.
Little-known fact: if you're able to eat all four power pellets within three seconds of one another, pac-man jumps up to light-speed. The ghosts start moving backwards, the maze deconstructs around you, and you have to watch him be born, and then slip backwards into un-life.
(waaaaa-waaaaa-waaa-wa-wah.)