The general structure of the manual is actual fairly simple, and one that doesn’t deviate too far from a typical instruction manual.
This tone also works to tell to player what to expect in the game proper a game that cares about Greek mythology, but one that’s also silly and eager to joke about it. It’s also more than happy to communicate through goofy humor to make the read go quickly. Zeus manages to explain the same material as any other game might, but makes the read interesting by framing it as a story told by a Muse about a hero’s journey.
It manages to keep this framing to explain everything, no matter the instruction. Zeus’ 201 page manual unfolds as a story told by the Muse Calliope about the hero Democrates.