Pac-Man Theory (probably the best one ever)

Eating stuff gets you points. Eating food with more sustenance gets you more points. Enough points gets you an extra life.

Therefore, Pac-man is eatng all this food to prevent malnutrition in the field of battle.

There is no escapee, insane person, Jigsaw, lost souls, or mutant. You still have the ghosts from the netherworld, who want to take over the overworld; you still have the Pac-People, who live on the overworld, who fend off the ghosts with power pellets.

That is literally it.

And that's why I think it's the best Pac-Man theory ever.